It leads to a former hospital’s old root cellar.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

Mysterious rocks that ring musically when struck.

Northern Ireland's Brobdingnagian stepping stones.

The first declared National Monument in the United States.

An Australian lake whose pink hue defies scientific explanation.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Staves, storm-calling, and of course, necropants.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

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

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Rippling sand dunes frozen in the Arizona rock.

On Japan's Tashirojima Island, cats are king.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The pharmacy's retro ice cream mixer is one of the last of its kind.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

The 606 is a decade in the making.