This iconic Russian space museum sits on a landmark space production facility and houses the Vostok 1, the first manned spacecraft, that was also built here.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

Colorful concentric circles honor a small Croatian town's supposed spot at the nucleus of it all.

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

These fantastically named natural pools look like something out of a Scottish myth.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

An encyclopedic collection of mammal penises.

A curious collection of mechanical moving figures.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

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

This series of Scottish caves has no clear purpose other than baffling historians.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.