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

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

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

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

This enigmatic building features numerous architectural styles.

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

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

Victorian "Fancy Craft" Hair Wreaths and Relics.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

This super steep hike ascends 2,000 feet in less than a mile.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

The country music legend's grave is surrounded by Astroturf because fans kept plucking out the grass.

Museum celebrating the history of computers, especially their role in codebreaking.

This trio of neolithic stone monuments are fabled to be a king and his knights that were petrified by a witch.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

148 feet long and in the middle of a verdant forest.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Largest illuminated advertisement sign in the world.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.