The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

The "Prussian Versailles" that is as glorious today as when it was built.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Berlin's old airport.

A fascinating insight into daily life in the Eastern Bloc.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

Walk behind a 50-meter-high waterfall.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

Famously misunderstood wonder of the ancient world

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The final resting place for the remains of 143 Habsburg royalty.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The anatomical-pathological collection of a man who changed surgery.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The largest 19th century panorama in the world still in-situ.

The world's largest collection of witchcraft regalia.

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.

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