Natural feature

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Agassiz Bedrock Outcrop (Hancock County, Maine)
Alum Spring (Onslow County, North Carolina)
August 13 Clark's Lookout 1805 (Beaverhead County, Montana)
Badlands National Park (Pennington County, South Dakota)
National Park
Ball Mill Resurgence (Perry County, Missouri)
Battery Rock (Hardin County, Illinois)
Blue Pond (Bollinger County, Missouri)
Bradford House II (Jefferson County, Colorado)
Burnett Springs (Logan County, Arkansas)
Burris House and Potawatomi Spring (Carroll County, Indiana)
Colossal Cavern Entrance (Edmonson County, Kentucky)
Drakesbad Guest Ranch (Plumas County, California)
Elephant Rocks State Park (Iron County, Missouri)
State park featuring pink granite rock formations
Grandfather Mountain (Avery County, North Carolina)
Hanging Rock (Montgomery County, Pennsylvania)
Hillside (Plymouth County, Massachusetts)
Horicon Marsh (Fond du Lac County, Wisconsin)
31,653 acre marshland along the Rock River
Horicon Marsh (Dodge County, Wisconsin)
31,653 acre marshland along the Rock River
Little John Creek Reserve (Morris County, Kansas)
Look See Tree (Drew County, Arkansas)
Looking Glass Rock (Transylvania County, North Carolina)
Natural landmark - pluton monolith in the Appalachian Mountains of western North Carolina
Lost Hill (Scott County, Missouri)
Isolated hill and rock outcroppings along Route M west of Scott City
Lost River Cave and Valley (Warren County, Kentucky)
Ancient Cave Valley with bluehole river with various uses since prehistoric times.
Marengo Cave (Crawford County, Indiana)
The cave offers two walking tours, gemstone mining, a maze crawl, gift shop, walking trails and picnic grounds.
Mazon Creek Fossil Beds (Grundy County, Illinois)
Mushroom Rock State Park (McPherson County, Kansas)
Dakota sandstone concretions, some having mushroom shape.
Nazi Spy Landing Site (Hancock County, Maine)
Petrified Sea Gardens (Saratoga County, New York)
Platte Mound (Lafayette County, Wisconsin)
Quarries of the Hummelstown Brownstone Company (Dauphin County, Pennsylvania)
Raven Rock (Harnett County, North Carolina)
Rock formation on piedmont fall line of Cape Fear River
Sand Prairie Conservation Area (Scott County, Missouri)
Remnant sand prairie preserved as a state conservation area
Santa Fe Trail--San Miguel County Trail Segments (San Miguel County, New Mexico)
Savanna Portage (Aitkin County, Minnesota)
Schoonmaker Reef (Milwaukee County, Wisconsin)
Soldiers' Home Reef (Milwaukee County, Wisconsin)
State Quarry, Old (Johnson County, Iowa)
Sugar Loaf (Winona County, Minnesota)
The Gulf (Wayne County, Missouri)
Collapsed cave and underground lake southwest of Mill Spring
Tower Rock (Cascade County, Montana)
Tower Rock (Perry County, Missouri)
Town Doctors' House and Site (Suffolk County, New York)
Van Hise Rock (Sauk County, Wisconsin)
York Iron Company Mine (York County, Pennsylvania)