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

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

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

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Atop this former dutch railway office sits an interstellar work of art.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Christ's blood preserved in a Belgian town.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

Clusters of huge boulders in the Australian Outback.

The UFO capital of Australia is the outback’s answer to Roswell.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

Designed as a reminder of one of the darkest moments in Austrian history.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

The second oldest continuously operating bar in Louisiana.

The final resting place of New Orleans' most famous voodoo priestess.