This airfield is home to a number of retired vintage planes in various states of disrepair.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

A well-preserved example of an early industrial operation in the northeastern United States.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

A bizarre roadside attraction and the first instance of miniature golf in the world.

More than five miles of underground passageways.

An abandoned town is hidden in Great Smoky Mountains National Park.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

Home on the Hillside, and home of the first breakfast cereal.

A memorial to the 1913 tragedy that helped protect the workers of the future.

An abandoned castle owned and ignored by Masons carries a cursed history.

Over 50 whirling pools left behind from the glacial age.

To avoid the demolition costs this abandoned drawbridge was simply left in the up position.

A once-booming railroad left abandoned next to the Quinnipiac River marshes now intersects with a hiking trail.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A quirky collection of outsider art made from automobile parts.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

A natural gas leak provides a flickering flame beneath a waterfall.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

A former copper mine which became a truly unsuccessful prison.

Amazing views of Long Island Sound can be seen from this mountaintop tower.