This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This historic California cemetery holds the bodies of veterans of both the Civil War and the Donner Party.

This basement museum explores the art and artistry of fascism.

This tangled English forest looks like something right out of a fairytale.

This Connecticut chapel is a starkly modern, and surprisingly colorful, architectural rebel.

Surrounded by lonely toys, this Massachusetts gravestone marks the final resting place of six children who were murdered by poverty.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

This amended headstone marks the grave of a participant in one of the most successful military deceptions of all time.

A veteran Disney animator turned his gift for storytelling to a museum devoted to his love of a California city.

The legend of a monkey that was hanged as a spy has inspired not only a football team name, but a successful mayoral campaign.

This odd stone memorial remembers a loyal dog who offended the rail barons with his speed and saved his master with his pee.

A reversed traffic signal that was once violently misinterpreted as a statement on British-Irish relations.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Sitting empty in a lonely Canadian field is a century-old stone bunker sometimes called "One Man's Castle."

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The world's largest boar is a huge steel titan found at a French rest stop.

A 1950s eccentric's vision of Eden preserved as a hiking trail.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This huge clock made of flowers and simple machinery was once used a political weapon.

The only surviving prototype for Buckminster Fuller's house of the future.