A gravestone marks where a man's lost limb was laid to rest.

An abandoned Depression-era zoo hidden just off the highway.

The farthest you can be in the contiguous U.S. from a McDonald's location.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

Stories of sightless fish and ghostly cowboys are only a fraction of the legends surrounding this Kansas sinkhole.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

The final resting place of the world's first nuclear reactor.

All that's left of the quintessential "cabin in the woods."

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

Julia Buccola Petta's body was peculiarly well-preserved when it was exhumed six years after her death.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

This otherworldly church spire reaches up toward the heavens.

European castle ruins in an American state park are actually the product of death and grief.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

A bizarre house filled with an astounding array of collections.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.