The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

This massive library holds what was once the largest book collection in the world.

This anatomical sculpture raises awareness about violence against women and promotes gender equality.

Trek up this glacier before it disappears.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

His "Lionheart" is entombed separately from the rest of his body.

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

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

Legend has it this 11th-century castle was paid a visit from the devil.

Natural mummies hidden in the crypt of a medieval French church.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

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

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

A swath of France so devastated by war it is still forbidden to go there.

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

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

The world's largest reflecting pool is just two centimeters deep.

A medieval military street hidden beneath a charming French fishing village.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

Ghosts of France's colonial past.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.