A church of bones, decorated with 40,000 human skeletons.

This bridge was constructed from the rubble of the infamous Bastille.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A moving memorial to the fallen and missing from WWI trenches.

A little sculpture with a large wardrobe.

A rare example of World War I trenches from the British front.

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

A crumbling cathedral condemned by an earthquake.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

A series of tiny artificial islands rich with produce bob atop the surface of the lake.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

This unique temple complex remains off the typical tourist trail.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

A blooming house of worship for the masses.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

A strangely forgotten claimant to the much contested title of "Source of the Nile."

The home of half the world's population of critically endangered mountain gorillas.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.