Baroque celebration of the end of the Great Plague of Vienna.

Macabre astrological automaton clock dating to the late 1400s.

Monument to a suicide protesting the Soviet invasion.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

At 207 feet, one of the world's longest continuous escalators.

The only thing stranger than stumbling onto these philosophical musings is the story of the homesteader who created them.

An office built to look like a giant basket.

A castle built by an eccentric medieval enthusiast in rural Ohio.

Famously misunderstood wonder of the ancient world

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A cemetery for Slovenian notables also serves as a popular recreation space.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A whimsical bridge adorned with decorative dragons.

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

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

Hundreds of hidden passageways weave through the old quarters of Lyon.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.