One street divides a single town that stands in two U.S. states.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A suspended garden, now gone, once hung in the middle of this abandoned church.

Where beautiful signs live on forever.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

An unassuming 13-acre park is home to over 12,000 roses.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

This structure among the trees was the result of divine inspiration.

This boulder stays on its mountain thanks to a huge chain and on the map due to local legend.

Moonbows over Kentucky.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

This magnificent Cincinnati graveyard is also a popular public park.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

Stroll through a wonderland of stupendous moss-covered trees.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.