A little-known ruin with a convoluted history and a fascinating latrine drainage system.

These remarkable cascades are the jewels of Upper Tees.

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.

This oddly beautiful water cistern is a techno-temple to the wet stuff and a multimedia masterpiece.

Legend says this demonic carving inside a medieval cathedral was one of Satan's minions.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

An architectural oddity hides in plain sight on this iconic London bridge.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

This small roadside eatery exists in both the Northern and Southern hemispheres, as the equator runs right through it.

This 700-year-old storehouse was a POW jail, aviation workshop, and Titanic memorial before becoming a brewpub.

This Bronze Age burial mound used to be called "Robin Hood’s Piss-Pot" until it was renamed by spoilsport Victorians.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

This sculpture meant to honor the bravery of the Indigenous Mapuche people of Chile proved controversial.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Exquisite carvings of leaves, Green Men, and the occasional dragon adorn a medieval chapter house.

Despite its grandiose name, this enigmatic first-century void under the town is no cave, and it's possibly not a palace either.

These 90-year-old murals of local kings, Vikings, and outlaws hide in plain sight in a beautifully baroque shopping arcade.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.