Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Morocco's Argania trees are infested with nut-hungry goats.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

The attic of a four-century-old canal house hides a clandestine church.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

This gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

This "social palace" housing complex created a relatively stable and self-contained worker's society... for a time.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

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

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

There has been an astronomical clock on this spot since the 14th century.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

This collection of lurid religious statues tell the tales of a saint who stood down the devil.

The tiny Belgian town's ancient version of Mardi Gras involves eerie wax masks, sticks for warding off evil, and ostrich plume hats.