An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Enormous sandstone towers loom within a Czech forest.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

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

Looming communist pillar with a Czech twist.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

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.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The fairy tale castle of the "fairy-tale king."

This one-time health resort was used by aristocrats around the world.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Double spiral staircases are not unheard of, but they are very rare.

This massive Trojan ursine was built to be a new tourist symbol for a small Swedish town.

Enigmatic bug-like sculptures mystify drivers along a Swedish highway.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

This roadside attraction looks like a flying saucer parked atop the tundra.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.