It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

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

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

A museum wholly devoted to juvenescence.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

This hidden green space is the city's second largest conservatory.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

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

Banksy gives themself artistic license with this piece of London street art.

Hidden beneath the streets of London is a secret subway that only carried mail.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

One of the most easily accessible examples of the rare 1960s UFO houses.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

France's high-tech, future-themed amusement park.

One man's fifteen-year diversion lead to a garden of intriguing sculptures.

A small island dotted with old, historic Finnish buildings.

An abstract monument to a symphonic composer.

The greatest amusement park in the world is wall-to-wall farting dogs, puking rats, and cows with exposed breasts for the whole family.