This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

This trail follows unique stone railroad tracks and a historic waterway to the south coast of Devon.

This harsh mountain path was built as a strange attempt to improve the health of Turkmen citizens.

The last SR-71 ever constructed.

The largest permanent Monopoly board makes one of the longest games even bigger.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

It took an artist 20 years to create this sprawling sculpture garden honoring the area's ancient inhabitants.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

Along a California highway is a kind of Jurassic Park made of metal.

Dozens of large-scale, creative, evocative curios from prominent artists dot the calm outdoor space around this major museum.

This former shopping outlet is now adorned with beautiful graffiti and murals.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

Although it appears much older, this castle-like tower is actually a Georgian-era folly.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.