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

This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Hundreds of caves once used to store grains and animal feed.

Bacteria and algae give the salty water its bubblegum hue.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

When you've got to go, you've got to go.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

An existential riddle in the world's largest ancient castle.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

This former quarry is now a picturesque gorge that hides a sunken lake.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

The first museum in the world devoted to sexual gadgetry.

Two monstrous faces loom over a village in Czechia.

An ethereal glowing blue ocean cave in Croatia.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

A Jenga-style cylindrical tower of books that appears to go on forever.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.