Ultimate Road Trip of Discovery to Uncover Unique National Natural Landmarks

Discover 16 awe-inspiring natural wonders

Planning your RV road trip routes for the year already? You may want to consider squeezing in at least one natural landmark into the itinerary. In January, Former Secretary of the Interior David L. Bernhardt named three new sites as national natural landmarks. Their addition brings the number of national natural landmarks in the United States and Territories to 602, a milestone for the National Park Service’s National Natural Landmarks Program. These sites are located in West Virginia, Colorado, and California:

  • Bear Rocks and Allegheny Front Preserve, West Virginia: The most distinctive feature of the preserve is the rocky, high-altitude plateau. The landscape includes wind-swept and stunted spruce trees, low-lying heath shrubs, rocky outcrops, and bogs. 
  • Sulphur Cave and Spring, Colorado: Amazingly, this highly toxic environment of hydrogen sulfide, carbon dioxide, and carbon monoxide gases is home to a flourishing ecological community. People cannot enter the cave due to its toxic air but visitors can learn more about the landmark at the Tread of Pioneers Museum in Steamboat Springs.
  • Lanphere and Ma-le’l Dunes, California: Located west of Arcata the coastal dunes are seemingly untouched keeping much of the features that once thrived on the west coast. Besides dunes, the site includes beaches, dune forest islands, salt marshes, deflation plain swales, freshwater marshes, and brackish wetlands.

We’ve explored America by RV and found these 13 national natural landmarks you’re sure to enjoy.

Patagonia-Sonoita Creek Sanctuary © Rex Vogel, all rights reserved

Patagonia-Sonoita Creek Sanctuary, Arizona

Patagonia-Sonoita Creek Sanctuary is a good example of a cottonwood-willow riparian forest and is one of the last permanent stream-bottom habitat areas in southern Arizona. The site retains a substantial part of the indigenous aquatic biota including the endangered Gila topminnow. The birdlife includes several Mexican species and is the only known nesting site in the country for the rare rose-throated becard.

Ramsey Canyon © Rex Vogel, all rights reserved

Ramsey Canyon, Arizona

Ramsey Canyon is a stream-cut, vertical-sided gorge. Cold air drainage from the upper canyon results in a well-defined microclimatic habitat that supports Mexican flora and fauna and plants that normally occur only at higher elevations. The site is also frequented by more species of hummingbirds than any other area in the United States.

Sandhill cranes on Willcox Playa © Rex Vogel, all rights reserved

Willcox Playa, Arizona

Willcox Playa, the largest “dry lake” in Arizona is a remnant of the pluvial Lake Cochise. Unlike similar dry lakes, the black mud below the surface contains a rich fossil pollen record of the pluvial periods of the Pleistocene. The site has become a night-time roosting area for 4,000-8,000 sandhill cranes and contains the greatest diversity of tiger beetles in the United States.

Corkscrew Swamp Sanctuary © Rex Vogel, all rights reserved

Corkscrew Swamp Sanctuary, Florida

Corkscrew Swamp Sanctuary contains a wide variety of habitats including pond cypress, wet prairie, pineland, and the largest remaining stand of virgin bald cypress in North America. The sanctuary supports the largest wood stork rookery in the United States and is important for several other endangered species.

Okefenokee Swamp © Rex Vogel, all rights reserved

Okefenokee Swamp, Georgia

Okefenokee Swamp, located within the Okefenokee National Wildlife Refuge, is one of the largest and most primitive swamps in the country. It contains a diversity of ecosystems and is a refuge for native flora and fauna including many uncommon, threatened, and endangered species.

Bitter Lake National Wildlife Refuge © Rex Vogel, all rights reserved

Bitter Lake Group, New Mexico

Located within the Bitter Lake National Wildlife Refuge, the Bitter Lake Group contains more than 30 natural sinkhole depressions formed by solution of gypsum-bearing rocks. The highly saline artesian lakes provide habitat for the only inland occurrence of a marine alga and two rare fish species. The site offers one of the best examples of undisturbed shrub-grassland and the process of succession and restoration to natural conditions following a disturbance.

Congaree National Park © Rex Vogel, all rights reserved

Congaree River Swamp, South Carolina

The Congaree River Swamp is the most extensive, mature cypress-gum swamp and bottomland hardwood forest complex in South Carolina. Located within Congaree National Park, the site provides a sanctuary for wildlife.

Frances Beidler Forest © Rex Vogel, all rights reserved

Francis Beidler Forest, South Carolina

The Francis Beidler Forest harbors one of the last large virgin stands of bald cypress-tupelo gum swamp in the United States. A significant number of rare, unusual or range extensions for plants and animals occurs in this unique natural area. Its five major community types provide habitat for an extremely rich diversity of species.

Cathedral Spires © Rex Vogel, all rights reserved

Cathedral Spires and Limber Pine Natural Area, South Dakota

Cathedral Spires and Limber Pine Natural Area, located within Custer State Park, is an excellent, rare example of joint-controlled weathering of granite. The site also supports a disjunct relict stand of limber pine. Commonly referred to as the Needles, it is a popular area for rock climbers.

Caverns of Sonora © Rex Vogel, all rights reserved

Caverns of Sonora, Texas

The Caverns of Sonora contains unusual formations such as bladed helictites and coralloid growths and is internationally recognized as one of the most beautiful show caves on the planet. The Cavern is over seven and a half miles long but only two miles of trails are developed for tours. There are five levels of the cave that vary in depth form 20 feet to 180 feet below the surface.

Enchanted Rock © Rex Vogel, all rights reserved

Enchanted Rock, Texas

Enchanted Rock, located within Enchanted Rock State Natural Area, is one of the largest rock mountains in the United States. It is a classic illustration of a batholith and of the exfoliation process. The coarse-grained pink granite is massive and uniform in composition and texture and is some of the oldest igneous rock known in North America. The massive pink granite dome rising above Central Texas has drawn people for thousands of years. But there’s more at Enchanted Rock than just the dome. The scenery, rock formations, and legends are magical, too!

Blanco River © Rex Vogel, all rights reserved

Little Blanco River Bluff, Texas

Little Blanco River Bluff is an unspoiled example of the natural assemblage of flora characterizing the limestone bluff communities of the Edwards Plateau. The site supports diverse flora, including an estimated 250 species in 25 families.

Ibis at Santa Ana National Wildlife Refuge © Rex Vogel, all rights reserved

Santa Ana National Wildlife Refuge, Texas

Spanish moss drapes from trees and noisy chachalacas welcome the morning dawn as a malachite butterfly floats out from the shadows. Step into a rare tropical world at Santa Ana National Wildlife Refuge, a living museum of the lowland forested area of the Lower Rio Grande Valley. The refuge’s jungle-like vegetation provides habitat for over 400 species of birds and about one half of all butterfly species found in the United States.

Worth Pondering…

In every walk with nature, one receives more than he seeks.

—John Muir