A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

Cycle the solar system—from the sun to Pluto—right here on earth.

Journey through this open museum where even employees remain true to period.

The bronze uniforms commemorate the vital role of women during World War II.

At the height of alum production at this factory, human urine was a valued commodity.

The house in the middle of the motorway.

A remarkable feat of Victorian engineering across the Firth of Forth.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

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

This spooky statue sits outside a famous Prague theater.

A series of playful yellow penguins share a serious message about the environment.

Macabre astrological automaton clock dating to the late 1400s.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

This monumental work of art symbolizes the coming together of a previously divided city.

A Reformation-era fiery figurehead once denoted this location as a print shop.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

Banksy's image of a naked man dangling from the window of a sex health clinic.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

Go back 50 years with a turn on one of the park's carefully restored vintage fairground rides.