To add content, ask questions.
OpenAI’s curated guide to U.S. National Monuments, highlighting their history, significance, and natural beauty.
Arizona
California
Colorado
Oregon
Utah
Washington
Table of Contents
- Cascade–Siskiyou National Monument
The Cascade–Siskiyou National Monument protects one of the most biologically diverse places in the United States, at the crossroads of the Cascade, Klamath, and Siskiyou mountain ranges. This area is celebrated for its unique blend of species and habitats, rich history, and opportunities for year-round outdoor adventure.
- John Day Fossil Beds National Monument
A premier national monument in eastern Oregon, preserving over 14,000 acres of vividly colored badlands, world-class fossil beds, and unique geologic formations. Explore ancient ecosystems preserved from 44 to 7 million years ago, through miles of scenic trails, stunning viewpoints, and immersive visitor centers.
- Newberry National Volcanic Monument
Newberry National Volcanic Monument, created in 1990, protects over 44,000 acres of volcanic terrain in central Oregon. Visitors experience lava flows, caves, crater lakes, forests, and scenic trails in a unique volcanic landscape managed by the U.S. Forest Service.
- Oregon Caves National Monument and Preserve
Nestled in the Siskiyou Mountains of southwestern Oregon, Oregon Caves National Monument and Preserve protects a unique marble cave system known as the “Marble Halls of Oregon,” along with its surrounding lush forest, rare species, and century-long history of exploration and stewardship. Visitors can enjoy guided cave tours, scenic hiking trails, and camping in a spectacular subterranean and mountain environment.
- Hanford Reach National Monument
Hanford Reach National Monument, located in south-central Washington state, is a vast protected area preserving the last free-flowing stretch of the Columbia River in the region. The monument safeguards diverse shrub-steppe habitat, critical fish and wildlife resources, and a landscape shaped by Ice Age floods and human history.
- Mount St. Helens National Volcanic Monument
Mount St. Helens National Volcanic Monument preserves the area affected by the 1980 eruption, allowing natural recovery while offering dramatic volcanic landscapes, hiking trails, and educational sites in the Pacific Northwest.
- San Juan Islands National Monument
San Juan Islands National Monument preserves key lands in the San Juan Islands, including shorelines, forests, and prairies, safeguarding wildlife habitats and cultural sites. Visitors can hike, kayak, and learn about the region’s rich history and ecology. The monument is managed for conservation and public enjoyment.
- Berryessa Snow Mountain National Monument
- California Coastal National Monument
- Carrizo Plain National Monument
A spectacular, 250-square-mile landscape managed by the Bureau of Land Management, famous for springtime super blooms, native wildlife, and the San Andreas Fault’s dramatic surface expression. A premier destination for hiking, camping, and nature viewing in California’s interior sagebrush desert.
- Castle Mountains National Monument
Castle Mountains National Monument preserves unbroken desert landscapes, including Joshua tree woodlands, grasslands, and rocky mountain terrain. Visitors can experience solitude and explore a rich array of plant and animal life, as well as historic sites, in this remote corner of the Mojave Desert.
- César E. Chávez National Monument
The César E. Chávez National Monument preserves the home, work sites, and legacy of César E. Chávez, the renowned Latino labor leader and civil rights activist. Located in Keene, California, the monument honors his lasting impact on the farmworker movement and social justice in America.
- Devils Postpile National Monument
Established in 1911, Devils Postpile National Monument preserves one of the world's finest columnar basalt formations, Rainbow Falls, and pristine Sierra Nevada scenery. The 60-foot symmetrical basalt columns, 101-foot high waterfall, and alpine meadows are the monument's geological and ecological highlights. Located near Mammoth Lakes, California, the monument is best accessed in summer by shuttle and offers hiking, camping, and wilderness exploration. — Summary of key details from the National Park Service
- Fort Ord National Monument
Fort Ord National Monument is a vast protected area in central California featuring coastal dunes, grasslands, oak woodlands, and chaparral. It offers a premier destination for hiking, mountain biking, horseback riding, and wildlife viewing in the Monterey Bay region. The monument protects military history, rare species, and diverse habitats formerly used as an army training base.
- Giant Sequoia National Monument
The Giant Sequoia National Monument, located in the Sierra Nevada foothills of California, is a vast protected area dedicated to preserving the majestic giant sequoias and their diverse forest ecosystem. Managed by the U.S. Forest Service, the monument offers opportunities for exploration, recreation, and stewardship of these ancient giants and their habitat.
- Mojave Trails National Monument
The Mojave Trails National Monument safeguards 1.6 million acres of the Mojave Desert’s rich ecological, geological, and cultural heritage in southeastern California. This vast preserve offers solitude, wildflower displays, historic sites, and unparalleled opportunities for desert exploration.
- Muir Woods National Monument
Muir Woods National Monument is a sanctuary of old-growth coast redwoods, scenic creekside trails, and rich wildlife. Experience towering trees, peaceful footpaths, and temperate rainforest wonders just north of the Golden Gate Bridge.
- Sand to Snow National Monument
Sand to Snow National Monument is a spectacular landscape bridging desert to alpine environments in Southern California. Designated in 2016, the monument protects over 154,000 acres of diverse ecosystems, rich cultural heritage, and offers year-round outdoor recreation from low-elevation deserts to snowy mountain peaks.
- San Gabriel Mountains National Monument
The San Gabriel Mountains National Monument protects a vast and scenic area of the San Gabriel Mountains in Southern California. Established in 2014, it preserves rugged peaks, deep canyons, diverse wildlife, and historic sites north of the Los Angeles metropolitan area. The monument is managed by the U.S. Forest Service—Angeles National Forest—and offers year-round outdoor recreation, ecological research, and cultural heritage exploration.
- Santa Rosa and San Jacinto Mountains National Monument
- Bears Ears National Monument
Bears Ears is a spectacular national monument in southeastern Utah—centering on Bears Ears Peaks, extending across mesas, canyons, and archeological sites. It is stewarded by Indigenous tribes and federal agencies to protect cultural heritage, wilderness, and plant and animal life.
- Cedar Breaks National Monument
Cedar Breaks National Monument is a stunning 3-mile-wide, half-mile-deep amphitheater carved in colorful Claron Formation rock. The park is home to ancient bristlecone pines, vibrant wildflowers, and star-filled night skies, offering alpine hiking and wilderness experiences above 10,000 feet. Access is seasonal due to winter snow.
- Dinosaur National Monument
Dinosaur National Monument preserves an extraordinary treasure trove of over 1,500 dinosaur fossils, rugged canyons, scenic rivers, ancient petroglyphs, and diverse wildlife across more than 210,000 acres straddling the Colorado-Utah border. It invites visitors to explore prehistoric wonders, dramatic landscapes, and rich cultural history.
- Grand Staircase–Escalante National Monument
Grand Staircase–Escalante National Monument is a vast, remote landscape of southwestern canyons, colorful cliffs, dinosaur fossils, ancient sites, rare plants, and desert wildlife. Designated in 1996, it protects more than 1.8 million acres of the Grand Staircase—a region of step-like geological terraces—and the Escalante River watershed. The monument offers world-class hiking, backcountry adventure, scientific research, and wilderness experiences【user-supplied】.
- Hovenweep National Monument
Hovenweep National Monument preserves six prehistoric Ancestral Pueblo sites on the Utah-Colorado border, featuring multistory stone towers built between AD 1200–1300. Explore hiking trails, stunning masonry, and scenic canyons where ancient ingenuity still captures the imagination.
- Natural Bridges National Monument
- Rainbow Bridge National Monument
Rainbow Bridge National Monument in Utah is home to one of the world's largest natural bridges. Sacred to Native tribes, it can only be reached by boat or a long hike, and invites visitors to honor its awe-inspiring beauty and cultural history.
- Timpanogos Cave National Monument
Timpanogos Cave National Monument in Utah invites visitors to hike a scenic mountain trail and explore three stunningly decorated limestone caves. Ranger-guided tours reveal the geology, history, and beauty of this unique cavern system.
- Agua Fria National Monument
Agua Fria National Monument, established in 2000 and managed by the Bureau of Land Management, protects 71,000 acres north of Phoenix, Arizona. The monument preserves a vital riparian corridor, hundreds of ancient archaeological sites, and diverse desert wildlife and plant communities. Visitors can explore petroglyphs, hike scenic trails, and enjoy remote camping under vast desert skies.
- Canyon de Chelly National Monument
Canyon de Chelly National Monument is a living landscape where towering sandstone cliffs, ancient ruins, and Navajo families irrigating fields tell stories of nearly 5,000 years of continuous habitation. The monument offers scenic rim drives, ranger-led hikes, and guided canyon tours for an unforgettable Southwest adventure.
- Casa Grande Ruins National Monument
- Chiricahua National Monument
The Chiricahua National Monument, established in 1924 and located near Willcox, Arizona, protects a unique "wonderland of rocks" featuring rhyolite pinnacles and balanced rock formations, with trails, scenic drives, rich biodiversity, and significant cultural history. The monument preserves a dramatic landscape shaped by volcanic activity and erosion, with a diverse mix of flora and fauna reflecting its position at the intersection of multiple ecological zones.
- Grand Canyon–Parashant National Monument
Grand Canyon–Parashant National Monument is a 1.25-million-acre protected area established in 2000. Managed by the National Park Service and the Bureau of Land Management, it offers rugged, largely undeveloped wilderness stretching from the Grand Canyon’s North Rim to the Arizona-Utah border. The monument safeguards a variety of geological formations, diverse ecosystems, and historical sites including ancient cliff dwellings and mining relics .
- Ironwood Forest National Monument
- Montezuma Castle National Monument
- Navajo National Monument
Protecting Ancestral Puebloan cliff dwellings and cultural landscapes on the Navajo Nation. Experience ranger-guided tours, scenic overlooks, and desert wilderness.
- Organ Pipe Cactus National Monument
- Pipe Spring National Monument
- Sonoran Desert National Monument
- Sunset Crater Volcano National Monument
Explore the legacy of Arizona’s youngest volcano, hike through volcanic landscapes, and discover how fire and eruption have shaped the land and lives in this remarkable national monument.
- Tonto National Monument
Tonto National Monument protects two ancient cliff dwellings built by the Salado culture between 1300 and 1450 CE. The park preserves archaeology, Sonoran Desert ecology, and scenic riparian canyons near Roosevelt, Arizona. Visitors can hike to the Lower and Upper Cliff Dwellings, explore the museum, and enjoy wilderness desert beauty.
- Tuzigoot National Monument
Tuzigoot National Monument preserves a striking Sinagua pueblo atop a hill overlooking the Verde Valley in central Arizona. This 1,000-year-old stone pueblo includes 110 rooms and offers visitors a glimpse into prehistoric life, ancient architecture, and the dynamic human history of the region's first inhabitants. The site features a museum, trails, and panoramic views of the Verde River and surrounding landscape.
- Vermilion Cliffs National Monument
Vermilion Cliffs National Monument protects a vast landscape of vibrant red sandstone cliffs, slot canyons, desert basins, and rare ecological communities in northern Arizona and southern Utah. Managed by the Bureau of Land Management, the monument is famed for its geological wonders, biodiversity, and iconic formations like The Wave.
- Walnut Canyon National Monument
Walnut Canyon National Monument protects a strikingly deep canyon rimmed with ancient cliff dwellings near Flagstaff, Arizona. Visitors can hike into the canyon, explore scenic overlooks, and learn about the lives of the Sinagua people who occupied the area for centuries .
- Wupatki National Monument
Wupatki National Monument preserves the remarkable remains of ancient pueblos, including the 104-room Wupatki Pueblo, amid vast arid landscapes shaped by volcanic eruptions and centuries of resilient human life. Visitors explore history, hike trails, and experience desert plants and wildlife in the high desert. (≈150 chars)
- Browns Canyon National Monument
Browns Canyon National Monument is a stunning protected area in central Colorado known for its dramatic canyons, diverse wildlife, world-class fishing, and myriad recreational opportunities. Established in 2015, it preserves critical river corridors, alpine meadows, and rugged granite cliffs—offering visitors a backcountry paradise for adventure and solitude.
- Canyons of the Ancients National Monument
Canyons of the Ancients National Monument in southwestern Colorado is the United States’ most archaeologically dense landscape, protecting over 25,000 recorded sites. The monument preserves ancestral Puebloan cliff dwellings, pueblos, and field structures amid a vast high desert canyon terrain rich in natural and cultural resources. Management is focused on stewardship, research, and responsible public access.
- Chimney Rock National Monument
Chimney Rock National Monument is a volcanic landmark and archaeological treasure in southwestern Colorado. The monument preserves Ancestral Puebloan towers, rich flora and fauna, and offers ranger-guided tours and hiking trails amid spectacular scenery.
- Colorado National Monument
Preserving one of the grand landscapes of the American West, Colorado National Monument is a striking region of towering monoliths, red rock canyons, and high desert beauty. The park invites visitors to explore scenic drives, hiking trails, and rugged backcountry while encountering bighorn sheep, soaring eagles, and stunning geology.
- Florissant Fossil Beds National Monument
Florissant Fossil Beds National Monument preserves a world-class 34-million-year-old fossil ecosystem in central Colorado, featuring giant petrified redwoods, delicate insect fossils, ancient lakebeds, and volcanic history. Explore trails, museum exhibits, and more to uncover Earth’s deep past.
- Yucca House National Monument
Yucca House National Monument is a large, unexcavated Ancestral Puebloan pueblo set in the scenic Montezuma Valley. Since 1919, it has preserved an important site of prehistoric occupation—offering ranger-led exploration and a rich natural and cultural heritage within a landscape of cacti, rocky mounds, and desert wildlife.
Last updated: Fri Jun 6, 2025