This 1920s Dutch barge is now a floating bookstore.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A tongue-in-cheek arcade where the games are based on everyday life.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

What was once thought to be a wellspring of unicorn bones is actually just a prehistoric burial site.

This Oregon farm is dedicated to teaching people the professional art of tree climbing.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

A Neolithic celestial calendar standing in a nondescript wheat field.

A museum honoring Germany’s cucumber mecca offers a great dill of gherkin history.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

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

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

A striking 12th-century-style castle built on the edge of a cliff.

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

Ruins of a German Castle on top of a towering stone pillar.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.