One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

An Austrian house of bones filled with hundreds of intricately painted skulls.

This demonic monument commemorates a carving destroyed in World War II.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

This Cold War–era fallout shelter was actually a storage facility for the nation's emergency currency.

This 600-year-old home seems to defy physics.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

It's said the devil used this mushroom rock as a table for a late-night meal.

Legendary site where an evil bishop was devoured by rodents.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

This fascinating museum in an old water tower holds the world's largest collection of Vodou artifacts from western and central Africa.

Wander among free-roaming storks at the sanctuary that helped save them from local extinction.

In this German city center, the streets have no names.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

Under Hanoi’s medieval citadel sits a secret military headquarters from the final years of the Vietnam War.

A triumphal steel arch on the side of a German mountain.

These fantastically named natural pools look like something out of a Scottish myth.

A former ironworks that was the first UNESCO industrial site.