Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

This 12th-century house is one of the oldest continuously inhabited houses in Britain.

A hidden path at the National Theatre lets you look behind the scenes of the latest productions.

The world's oldest family-run magic shop is hidden beneath a bustling London thoroughfare.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

Traveling collection of amazing automata.

Collection dedicated to brands, packaging and advertising.

This 1920s Dutch barge is now a floating bookstore.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

A tongue-in-cheek arcade where the games are based on everyday life.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Ship-sized kinetic sculptural fantasy.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

A Japanese video game arcade hides in the back of a Swedish pool hall.

The single richest source of elemental discoveries in the world.

It's always game time at Stockholm's only museum devoted solely to video games.

The internet as provided by a James Bond villain.

Stockholm's deepest subway station is also a stunning ecological wonder.

The library's graceful rotunda is like a bibliophile's temple.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.