Nondescript elevator doors open to reveal a stunning, surreal world.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A reproduction of earth's many biomes.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

The longest navigable underground river in the United States is home to countless blind and albino animals.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

Panorama exhibition hall in old silent theater with a beautiful backyard garden.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

A colorful architectural gem in Seattle's uniquely modern Central Library.

See massive fossils that are over 200 million years old in northeastern Arizona.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Rare recess caves fill this unbelievably beautiful Ohio park.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

A clear blue swimming hole with hidden caves, still unexplored.

Private collection of art inspired by cabinets of curiosity.

The eccentric mansion of one the most popular horror authors of modern times.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

The trials and tribulations of marking Poe's grave.

An antiquated German apothecary on Chicago's North Side.