A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Geothermal waterfalls in Tuscany.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

The largest drain hole in the world.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Hear the quietest sound from across the dome.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A fantastic castle rumored to be the birthplace of King Arthur.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

Canyon walls shrouded in ferns.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

The hallucinogenic center of the ancient world.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Venice's "Island of the Mad."

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

This little museum is built on a theater that was once a wildly elaborate speakeasy.