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

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

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A one-of-a-kind collection of a unique medium.

An eerie, derelict amusement park in Berlin.

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

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

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

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

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

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

Tucked in the back of this amazing antique store is an important piece of medical history.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

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

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

A psychedelic labyrinth on the San Francisco bay.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

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

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

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

An exquisite tunnel of cascading flowers.