Terrifically morbid cemetary and site of famous Paracelsus' grave.

The world's oldest known salt mine.

An Austrian house of bones filled with hundreds of intricately painted skulls.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

One of the largest underground systems runs under Canada's largest urban center.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

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

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

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

The Lone Star plaque hangs in a bombed-out bunker in Normandy to honor a Texan colonel's heroic actions on D-Day.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

The celebrated eyesore created by starry-eyed sweethearts.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

The video game-themed street art first popped up in the French city.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

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

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.