The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Medicinal spa created with the discharge from a geothermal energy plant.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

One of the last Jazz Age "Wonder Theaters" in New York City.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

A medieval relic whose great hall once hosted Mayflower pilgrims, one of Henry VIII’s ill-fated wives, and plenty of royal intrigue.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Venice's "Island of the Mad."

An alchemist's "magic door" stands in the middle of a Roman park.

Pompeii's less famous neighbor is still revealing her secrets.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Thousands of well-dressed mummies below a monastery.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A submerged archeological park still holds the wonders of a Roman Sodom.

A 16th-century horror show built in a lovely Italian garden.

An urban forest overtakes what was the greatest failure of utopic urban housing.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.