This Tuscan lake hides a 13th century town that is still visible when the water recedes.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

The venerated body of a 12th century saint is celebrated each year with the 'Race of the Candles.'

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The prototype for all Nazi concentration camps.

Striking occult iconography on a medieval German church.

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

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

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

Oriental bazaar in the heart of Sarajevo.

The place where World War I began.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

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

This abandoned Slovenian military barracks has become a punky-political art squat.