These pink granite water slides are the result of millions of years of erosion.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

Grapes be damned, this distillery makes wine from apples, blueberries, cranberries, and more.

According to legend, this rock represents a young girl trapped by an evil ocean spirit.

The oldest pictographs on this decorated rock formation in California's Carrizo Plain date back as many as 4,000 years.

An industrial waste tourist attraction.

Deep vertical fissures like miniature slot canyons cut across the cemented volcanic rock of Black Point above Mono Lake.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

A building that was once a general store, a speakeasy, and a newspaper office now holds a small gallery filled with New Orleans photography.

Generations of rockhounds got their start at this beloved, historic mine.

California's longest-running tourist attraction is a stump.

Home to a dizzying array of letterpress blocks with a rich history.

A natural sandstone bridge hidden in the Sewanee forest.

A beautiful red-faced slot canyon in northern New Mexico.

Built in the 1920s, this co-op in the Bronx feels more like an Italian villa than a typical New York apartment building.

This monument built by Japanese American immigrants spent decades underground.

Hawai'i's oldest wooden house was shipped around Cape Horn from Boston in 1820.

The former home of the army detachment that captured Geronimo.

Now a pedestrian bridge, this was once part of a narrow-gauge railroad that ran along the east coast of Kauai.

Named after an outlaw who used the basin as a hideout.

These markers are used to document elevation changes around the famed dam.

Once an ancient sea, this landscape of rocky ravines is filled with the fossils of ancient marine life.

California's largest steel arch bridge.

The longest spit in the United States ends at a lighthouse in the Strait of Juan de Fuca.