This erect, phallic geological spire wasn't always named so domestically.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

Natural rock water slides hidden in the remote forests of northern Idaho.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

These strange large stones served as a campsite and lookout post for generations of Native Americans.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A natural history wunderkammer in the middle of the desert.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

The fifth-longest natural arch in the world, and the longest outside China.

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

This vintage animatronics show is the Vegas version of a walk through the woods.

This century-old roadside attraction is full of bizarre rock formations.

The largest ancient burial mound in Ohio.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

One of the smallest towns in the United States.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.