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

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

A fearsome dragon clings to a corner of Munich's city hall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

This no man's land slicing through the island is strewn with abandoned relics of another time.

An ancient knight and a symbol of the city's freedom.

A little sculpture with a large wardrobe.

Climb inside an iron crystal magnified 165 billion times its normal size.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Double spiral staircases are not unheard of, but they are very rare.

The stunning interior of this Gothic church is covered in ornate gold details.

The largest known Ancient Egyptian obelisk.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

A marvel of Byzantine engineering under the streets of Istanbul.

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.

The remains of what was, not so long ago, the world's largest city.