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

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

There are eight natural springs around town, each with a slightly different taste.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The highest bridge in America was built for an almost unnervingly small amount of money.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Experience life in one of America’s smallest neighborhoods.

Victorian "Fancy Craft" Hair Wreaths and Relics.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This towering statue of Jesus provided internet to the surrounding area.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

Legend says this sculpture commemorates a brave baker who rescued the city in the Thirty Years' War.

The world's first motorway was used as a racetrack until the late 1990s.

A moving and macabre World War I-era painting by the great artist Otto Dix.

A museum that chronicles the history of the Nuremberg Trials for Nazi war criminals in the building where the trials were once held.

This small town in Germany was once a center of peppermint production, and has the museum to prove it.

This decommissioned nuclear power plant offers tours of its Communist-era control room and reactor hall.