The only structure left with direct ties to the Salem witchcraft trials of 1692.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

The ghostly remains of an accidental sea.

Remnants of a storybook amusement park hidden behind a strip mall.

A snapshot of the city's fascinating voodoo culture.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

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

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

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

A bizarre house filled with an astounding array of collections.

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

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

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

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

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

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

A terrific purveyor of natural history objects and curios.

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

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

Rippling sand dunes frozen in the Arizona rock.

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

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

Toxic waste disaster that founded the Superfund program.

A seasonal movie monster museum featuring wax creations by a relative of one of the original Universal Studios monsters.