This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

Huge Russian Orthodox cemetery in danger of being converted into open public space.

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

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

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

France's most famous cemetery, with some of its most curious tombs.

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

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

A colorful narrow alley in Cuba is full of street art and sculptures made of found objects.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

The name doubles as an appropriate adjective for this small ossuary.

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

Flowers have mysteriously appeared on her effigy every day for the last 150 years.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

In a small churchyard in Dingolfing, Germany the quaint Schusterkapelle is there to remind you of your imminent mortality.

There are two dozen tanks just sitting in an open field in Lower Saxony.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.