Eccentric concrete mansion and museum designed and built by hand from the inside out.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

Astonishing rock formations dot the Brimham Moor landscape.

Two small chapels housed inside an ancient tree.

It houses the remains of a 17th-century version of the Titanic.

Monasteries on rock pillars, once accessible only by frayed ropes.

What is the Thing?

Taxidermied animals galore, by appointment only.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

A toxic ghost town sitting atop a massive coal fire.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A medical facility that has been kept frozen in time.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.