This historic Amsterdam bar used to accept sailor's monkeys as payment.

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

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

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

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

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

The most northern place on the mainland of Great Britain.

This man-made waterfall was designed to help improve access for spawning salmon.

It's believed this well was once plagued with evil spirits until St. Columba purified the water.

The longest staircase lock in Britain.

Largest lake in Great Britain measured by surface area.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

Though this large circular site is now named for the legendary king, its history dates back to the Neolithic era.

This beautifully situated lakeside Roman settlement was likely built during the reign of the Emperor Hadrian.

“It has nae lugs!”

Locals spent years successfully fighting to save this beloved Brutalist behemoth from demolition.

The second-longest pier in the U.K. stretches a whole kilometer into the Irish Sea.

This unique collection of lawnmowers includes vintage blueprints and automatic robot mowers.

Much of what constituted mid-century Liverpool now litters a beach outside of town.