An aluminum skeleton brings Chinese mythology to the French shore.

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

This massive blockhead sculpture hides an entire library.

The largest underground church in Europe.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

The narrowest street in Paris.

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

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

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

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

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

Hundreds of hidden passageways weave through the old quarters of Lyon.

An icy lake tucked among jaw-dropping alpine panoramas.

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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

Abandoned railway line circling the city of Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A cableway for car transport.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.