A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

Nature and art meet in this curvy creation

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Mysterious rocks that ring musically when struck.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A toxic ghost town sitting atop a massive coal fire.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

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

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

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

A devastated ruin in the south of Belize where British explorers claimed to unearth the Mitchell-Hedges Crystal Skull.

This WWII plane died a quiet death, and is now a garden eel playground.

An underwater city for the dead.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

Nature took her revenge on the "Wickedest City in the World."

At the point of oceanic inaccessibility, you can't get farther from dry land without leaving the planet.

The oceanic dumping ground where spaceships go to die.

This nugget of paradise earned its name for obvious reasons.

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

The world's largest bioluminescent area was undiscovered by science until 2005.