This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An aluminum skeleton brings Chinese mythology to the French shore.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

A pyramid in Central Europe of unknown origin.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Historic medieval fortified city in southwest France.

Monsters and miniatures are held in equal esteem at this wondrous museum.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

This ancient theater was once the home of fierce gladiatorial battles.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

Paris' linguistic guide to the international language of, yes, love.

Inside a former cabaret, seven floors of erotic art.

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

A series of abstract, silly sculptures represent the works of a great modern classical composer.

A haunting collection of the vanished and disappearing natural world.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A spherical "micro-nation" in the heart of Vienna.