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

A crumbling hospital from the 1850s on Roosevelt Island.

The world’s first penitentiary, meant to be humane, drove men insane.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

An enormous, inside-out glass globe built in 1935.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A sharp bend in a dramatic river canyon cut through red rocks.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

An emerald-green grotto just a short trip from Austin.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

A snapshot of the city's fascinating voodoo culture.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

On the Oregon coast is a natural hole that seems to be draining the sea.

Most-visited and most-photographed slot canyon in the American Southwest.

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

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

Rippling sand dunes frozen in the Arizona rock.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

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

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A psychedelic labyrinth on the San Francisco bay.