Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

Series of underground houses inhabited continuously for centuries.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

To the famous surrealist artist, liberty required two torches held high.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

France's high-tech, future-themed amusement park.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This otherworldly French waterfall looks like its waters have turned to stone.

Dedicated to the history and culture of smoking, this small museum now includes a vape lounge.

The historic Masonic Lodge in which the first-ever female Mason was initiated.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

One of the world's most complex timepieces.

A French library that makes sure its love of books is writ large... giant in fact.

A unique underground structure dating back to the 1st century BC.

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

This Parisian gem is one of the most incredible ethnographic museums in the world.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

An art world insider finds himself battling for his artistic home.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

Hundreds of dwarf beeches create an unusual, haunting forest in the north of France.

One of the largest ochre quarries in the world, hidden in a limestone landscape.