The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Two stunning 17th-century libraries and a cabinet of curiosities.

An enormous dragon scales the walls of this 17-story temple.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

It would take 35 firetrucks to fill this enormous glacial pothole.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

"The greatest unknown literary treasure in Los Angeles."

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

The famous animator's private station house and man-cave was the birthplace of imagineering.

Nancy Thompson's Home from "A Nightmare on Elm Street."

This grand mansion has starred in everything from Bones to Buffy.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

"Looks so real, it's scary!"

The private clubhouse for the members of the Academy of Magical Arts.

Welcome to the world's only museum dedicated to the Ukranian Easter egg.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

An eclectic treasure trove of maritime marvels.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

England’s ancient oak tree has such an impressive girth, people have been hosting parties within the hollow trunk for centuries.