Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This stunning concert hall has become a symbol of Iceland's national recovery.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A wall of chewing gum moonlights as collective art.

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

An oil baron's wild paradise and the winner of an ill-fated air race.

Nature's biggest mammal swims in landlocked Oklahoma.

These massive mitts are made of 30 tons of devotional bronze.

An acoustic anomaly with a mysterious cause.

Tucked in the back of this amazing antique store is an important piece of medical history.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

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