A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

The former hotel where Tesla invented the radio.

New York City's only preserved family home from the 19th century.

Mysterious 500-year-old tapestries depict a unicorn hunt.

New York City's smallest piece of private property.

Hans Christian Andersen for the postmodern world.

This small chapel is built of human bones and decorated with a golden skeleton.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

An eerie, derelict amusement park in Berlin.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

Statue of death tucked in the University of Medicine courtyard.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Venice's "Island of the Mad."

An abstract monument to a symphonic composer.

A subterranean house of worship carved right out of the bedrock.

Sweden's "good old days" painstakingly re-created in a model village.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This community on a small Venetian island has taken to painting their houses in bright neon hues.