This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Europe's largest community of crocodiles and alligators.

An abandoned masterpiece of Soviet Brutalist architecture.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Eighty million natural history specimens call this gargantuan museum home.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

An inverted staircase above the entrance to the Bethnal Green Underground Station functions as a memorial for people who lost their lives during the worst civilian disaster in the U.K. during World War II.

Visit on a Sunday morning to see some killer tricks.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

This hospital helped pave the way for treatment that drove down child-mortality rates in 19th and 20th centuries.

Its collection includes a broad array of social, geographic, graphic design, and political history.

This 1920s Dutch barge is now a floating bookstore.

These 19th-century gas tanks were remade into an apartment complex.

The world’s first interactive human body museum also serves as a chair for a giant orange man.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

Go inside a revolutionary, cage-less zoo where 35 species live and some of them roam free alongside their human visitors.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

A farm turned upside down.

Eat the ultimate iteration of Portugal's most beloved pastry.