A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A technicolor place of worship for Elevationists.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A lush green oasis in the middle of Chicago.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

An underwater city for the dead.

Every autumn, this hillside is ablaze with red summer cypress.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Rising from the sea like a stone monster.

An Australian lake whose pink hue defies scientific explanation.

Where America's first doomsday cult awaited the end of the world.

Home of an evil witch famous within southern folklore.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Famously misunderstood wonder of the ancient world

A hand-built folk art installation covered with messages of God's love.