The Citrus Variety Collection at UC Riverside contains two trees of each of the 1,000+ varieties of citrus.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

These 5,000-year-old cave paintings provide a glimpse into prehistoric Finnish life.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

A medieval church built into an ancient cave.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

These mysterious mazes carved on the rock may be up to 4,000 years old.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A unique waterfall that some believe attracts the fairfolk.

The world's largest collection of witchcraft regalia.

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

This ornate Weser Renaissance house was also the home of an infamous witch hunter.

These jeweled relics have a scandalous and contested past.

German and American troops joined forces to defend this fortress during the strangest battle of World War II.

Rumors and legends of secret Nazi activities surround this eerily remote island mansion.

This small Bavarian graveyard is filled with empty graves for German soldiers lost during the World Wars.

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

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

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