A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.

In the 1940s, Italian architect Mario Cavallè built a dozen of these round homes in northern Milan.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

The yawning maw of this pagan visage is said to bite off the hands of liars.

In the foothills of the lesser Caucasus, a centuries-old fortress still stands.

A top secret Cold War bunker hidden beneath a Latvian spa facility is now open for tours.

An abandoned village, frozen in time by the threat of a landslide.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

This abandoned Antarctic research station is a Soviet ghost frozen in time.

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

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.

The only cave in Louisiana has played host to a state's-worth of clandestine activities.

These are probably the most beautifully-crafted toilets you've ever seen.

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

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

The location of the Bridge of Death and the Gorge of Eternal Peril in "Monty Python and the Holy Grail."

An abandoned settlement originally established by British colonialists in the Andaman archipelago.

Ruins of a Carnegie family mansion on Cumberland Island.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

This Canadian island is a veritable garden of decay with countless abandoned structures dotting the landscape.

This foolish Victorian sea fort was converted to a deluxe hotel.