This astronomically-aligned stone circle was the first of its kind to be built in Great Britain after a 3,000-year hiatus.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

The world's smallest Austen museum is inside an unassuming phone booth.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

A museum wholly devoted to juvenescence.

The unusual stilted beacon is the town's only active lighthouse.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

This amazing ancient cave was kept secret for seven years to protect it from the public.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A Marxist summer camp full of fantastical statues lies tucked away and forgotten in the forests of Moscow.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Ozymandias’ time-keeping temple.

An endless sea of white conical domes.

A cheeky architectural easter egg.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

Enormous sandstone towers loom within a Czech forest.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

Mummified monks and the accidentally interred, in a 17th-century crypt.

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

Underneath this small church are 15,000 bones, arranged by an obsessive academic.