This folk art wall claims to be the world's one and only memorial to the bygone age of hippies.

World's first "penitentiary," meant to be humane, drove men insane.

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

The world's largest squirrel statue clutches a pecan bigger than your head.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

Thrilling and delicious complement to any dining experience.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A cenote sitting in the middle of a parking lot shows the Yucatán Peninsula at its most urbanized.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

Detailed sandstone carvings show an array of symbolism and adorable animals.

No one knows for sure why this town's dead refuse to rot.

The crumbling remains of a once-grand building.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

A giant hilltop cross marks the location of a sanctuary with stunning views of Acapulco.

The first outlet of Canada's biggest fast-food franchise has been slinging doughnuts since 1964.

Designed in the Romanesque style, this structure was once a fortress monastery.

This massive piece of artwork weighs more than 250 tons, and was designed as a tribute to the first president of the United Arab Emirates.

An abandoned Cold War missile radar site.

World's largest collection of serial killer artwork and other macabre exhibits.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

In the back of a nondescript sports bar is a museum-worthy mural by legendary cartoonists.