Here lies Lilly E. Gray, an alleged "victim of the beast," but the reason long remained a mystery.

World's largest cave was only discovered in 1991, and now offers tours to the public.

French commune at the heart of conspiracies.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

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

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

The wild west is still alive and well at this authentic mining town watering hole.

Originally built as a promotional giveaway, this suburban house was designed to be an IRL version of the Simpson home.

This former Mormon settlement is reemerging from the receding waters of Lake Mead.

The eerie ruins of an isolated abandoned town nicknamed "the Widowmaker" for its deadly gold mine.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

This granite monument at the site of an ill-conceived tourist attraction is built from the same stone as the Mormon Temple.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

Step into the cool deep past and unknown future of who begat who.

A replica that won't float away.

This geothermal hot spring hides beneath a slowly growing mineral dome.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

Jurassic Park—A Still Life.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

A small flooded ghost town with a few scattered structures remaining.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Rippling sand dunes frozen in the Arizona rock.