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

Peek through a transparent pyramid and drink in the mountain made of books.

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

Got apples?

Indents in the pavement are all that remain from a grisly death machine in Paris.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

A curious collection of locks and keys.

Notorious artist squat renovated into legal studios.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

These quaint French houses dangle precariously over a precipice.

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

Yugoslavia's biggest underground airport lies in ruins.

"World machine" built by an untrained Austrian farmer.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Romania's only crater lake with water as pure as if distilled.

The growing stones of Romania.

This collection of solar timekeepers includes the world's first digital sundial.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

Housing the groundbreaking maps and globes of Gerard Mercator.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

A visionary precursor to the Internet made of index cards.

The Devil’s own choice when he needs a drink in Brussels.