A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

This artificial cave looks like something out of a fairytale.

This mosque was based on Sub-Saharan Islamic architecture and created for the Senegalese Tirailleurs.

Avant garde house of Pierre Cardin on the Cote d’Azur.

One architect's organic, human-centric design has been fully realized in this alien art house.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This massive blockhead sculpture hides an entire library.

A reconstruction of a classic mansion on the island of Delos was designed for a historian and archaeologist.

A place to see how French aristocrats lived in the early 1900s.

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

This once-derelict building is now one of the most beautiful bookstores in the world.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

A stunning hermit's shrine on a steep rocky spur in Northern Italy.

A devastating landslide accidentally created this tourist hotspot.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Visiting this café is like visiting the Austrian grandma you wish you had.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Hidden up a dusty track off the Georgian Military Road is this fascinating waterfall with mountainous views.

Georgia's answer to Easter Island immortalizes the nation's great poets, artists, and leaders in stone glory.

Ruins of a former government building destroyed during the Georgian-Abkhaz war in the wake of the fall of the Soviet Union.