California's own majestic geyser is powered by a subterranean volcano.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

This locally-famous crevasse in New York State is icy all year round.

The world's brightest bioluminescent bay.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

The world's second largest single-dish radio telescope, once used to contact E.T.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

Electrical pylon in the shape of Disney's beloved mouse.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

A monument celebrating the idea of reaching inaccessible places.

This striking art museum holds an amazing series of curiosity cabinets.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

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

Huge abstract sculptures of the Puerto Rican Flag.

The yawning maw of this pagan visage is said to bite off the hands of liars.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Go inside to really appreciate this 500-year-old technological masterpiece.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Famously misunderstood wonder of the ancient world

A former waterfront market is now in the center of town due to some interesting Boston engineering.