An abandoned concrete jungle surrounded by a lush park.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.

A hobby born from insomnia has turned into a hangar full of objects that have been be-buttoned by the Button King.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

An Aztec snake god has taken the material form of an apartment complex.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

A modern addition to the Greenpoint skyline.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

A group dedicated to promoting boating, kayaking and environmental education programs.

A Turkish monastery tucked into a cliff wall.

One man's extraordinary topiary garden in a small South Carolina town.

Houses are tucked between, on, and underneath giant boulders.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Nature and beauty amidst pollution and industrial wreckage.

The oldest surviving botanic garden in the United States.

A collection of heirloom roses tucked in a spectacularly beautiful botanical garden on Lake Atitlan.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.