This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

This unique Renaissance castle was turned into a home for Nazi occultism.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

Made from trees and then abandoned, this fence is still growing along a path in Germany.

At this unusual park, domes, ladders, chairs, and more are made from trees.

The castle where Martin Luther secretly translated the New Testament from Greek to German while in hiding.

Where Mary Shelley’s "Frankenstein" and John William Polidori's "The Vampyre" were born.

A communal oasis on Lake Zurich.

A rare, flower-shaped example of Brutalist architecture in Switzerland.

Standing stones found on a construction site are re-erected.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

World's largest permanent maze made of 18,000 conifers.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

Caves famous for the dragon-slaying saint who lived there.

These spooky and unusual stone formations create an underworldly landscape.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

The world's most important buildings shrunk to a tiny size.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

The shell of a medieval fortress offers commanding views of the area it once protected.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.