An icy lake tucked among jaw-dropping alpine panoramas.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

A chapel on a volcanic core, marking the end of a successful journey.

Museum in a swimming pool where the water still flows.

Avant garde house of Pierre Cardin on the Cote d’Azur.

An aluminum skeleton brings Chinese mythology to the French shore.

The largest underground church in Europe.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

One of the greatest maze designer’s greatest mazes.

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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Notorious artist squat renovated into legal studios.

Abandoned railway line circling the city of Paris.

The world's tallest boat lift stands as a massive piece of industrial tourism.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

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

The remains of an entire Roman city can be explored in this interactive museum.

This hidden art nouveau gem was designed by an architect in search of a national style.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.