A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

A black and white solution to the Bolivian city's traffic problems.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Copenhagen's celebrated theme park and gardens.

The largest mosque in Germany.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

An early masterpiece of Le Corbusier, a famed Modernist architect, hiding in plain sight.

A musical instrument played by the sea.

A hilltop monastery on the Greek island of Hydra.

A tiny park in the middle of some big power politics.

A history of European missionaries in Malawi.

From neon green watering holes to bleached elephant foetuses, this Mozambique museum makes natural history weird.

Nelson Mandela lived here with his family from 1946 until his arrest in 1962.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

This Canadian hunting lodge is a long way from home.

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

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

A statue built to honor the elite soldiers who fought for Latvia during World War I.

Featured in one of the most iconic scenes in cinema history.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

A 14th-century European chapel sticks out of the facade of a Japanese hotel.

Known as the "Queen of Beach Markets," Calangute epitomizes Goa's beach flea market scene.