The largest earthwork effigy in the world.

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

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

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

Two insane asylum bodies embalmed by an amateur.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

This massive mushroom has spent centuries eating its way across a huge swath of Oregon.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

The cedar tree in Highgate Cemetery earned its title by accident.

The remains of a British railway rusting in the jungle mist of a Brazilian mountainside.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.

The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

This house's itty bitty size means no humans allowed.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

The "world's smallest volcano" has been used to store meals and dispose of dead bodies.

A mysterious castle built as a monument to lost love.