One of the U.K's earliest public water supplies is within the "plague village."

This jellyfish provides clean water for an entire Dutch province.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

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

Colorful and chaotic stacked hotel in North Holland.

The longest eruption in the history of La Palma originated with this volcano in September 2021.

The world's largest single-aperture telescope resides in the Canary Islands.

The largest salt farm in the Canary Islands is located at the foot of an active volcano.

These wooden balconies that are both decorative and functional.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

You can soak in three relaxing pools filled daily by the tide.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

A solid steel plane designed to catch fire over and over again.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A public urinal so pretty, it was declared a national monument.

A unique work of automotive art calls this shopping center home.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Europe's official "zero-level," the equator of elevation.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

A floating cat sanctuary on an Amsterdam canal.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.