Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

The world’s highest ski resort was deserted after an 18,000-year-old glacier melted away.

The ruins of this Roman temple dominate the small city in southern Lazio.

A simple tribute to the microscopic arachnid that gives its juices and its life to help make a speciality German cheese.

Is this statue at Naumberg Cathedral the fairest of them all?

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A deep mark on the remains of a Roman temple, believed to be left by a legendary warrior.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

A market built atop boats is one of the few floating holiday markets in Europe.

This isolated airport in the middle of the Everglades sees more alligators than planes.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

The commemorative stone column conceals a secret laboratory.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

This mysterious and unique painting is filled with symbolism.

This haunting sculpture was created as a statement on the mechanized warfare of the First World War.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.