A walk through the historic city center, under the streets of Seattle.

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

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Medical and zoological curiosities for sale.

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

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

France's most famous cemetery, with some of its most curious tombs.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

A snapshot of the city's fascinating voodoo culture.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

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.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

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

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

A psychedelic labyrinth on the San Francisco bay.

A terrific purveyor of natural history objects and curios.

The Home and murder site of the witch of Rehmeyers Hollow.

This educational institution and reference library specialize in the psychic arts and mediumship.

A mysterious light of unknown origin on the backroads of Missouri.

Visitors to this shop will find fossils, minerals, meteorites, skeletons, oddities, and much more.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.