Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

World's oldest and largest space launch facility, once a secret missile testing site.

Iranian tombstones shaped like male and female sexual organs.

The internet as provided by a James Bond villain.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

This fantastical icy castle is built anew every winter.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This attraction was abandoned after the Chernobyl disaster.

A Serbian church lit by chandeliers made of weapons.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

Microscopic scenes; some call it novelty, some call it art.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

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

Europe's second largest ossuary wasn't discovered until 2001.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Thousands of well-dressed mummies below a monastery.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

A curious collection of mechanical moving figures.

A book bound in the skin of an infamous criminal, along with countless other specimens.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

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

A 30-acre garden inspired by the principles of modern physics.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.