The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A toxic ghost town sitting atop a massive coal fire.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The world's only museum devoted to the wonders of fluorescence.

A 140-year-old castle with underground caves hidden in San Francisco.

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

A psychedelic labyrinth on the San Francisco bay.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

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

A church of bones, decorated with 40,000 human skeletons.

The fairy tale castle of the "fairy-tale king."

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

The sign at the garden gate reads: "These Plants Can Kill."

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

A crumbling hospital from the 1850s on Roosevelt Island.

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

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

The curiosities and wonders of pharmacy in a delightful historic building.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.