An open-air sewer system that was covered piece-by-piece over 300 years.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Former bridge turned into an observation tower.

A beautiful lighthouse with as many steps as days in the year, as many windows as weeks, and as many levels as months.

Fur-lined metal pod dangling in the French countryside.

A once drab public housing estate is transformed into a colorful gallery of trompe l’oeil murals.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

A resort destroyed by a mysterious bombing offers visitors only its remains and the riddle behind it's demise.

Lady Liberty's original designer installed a little clone in this French fountain.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

One man's stunning attempt at eco-friendly living.

The sunken structure looks like the victim of a catastrophic flood.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

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

The haunting concrete remains of a Nazi pebble crusher can still be found in this small French commune.

One architect's organic, human-centric design has been fully realized in this alien art house.

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

Fighting the British and making game shows for over 150 years.

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

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