Who knew the Devil's domain was a hot spot for tubing?

The world's largest public collection of PEZ memorabilia.

A miniature village lies nearly forgotten in the forest by the side of a major highway.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

A few stone foundations and an old graveyard are all that is left of this once thriving settlement in the wilds of Connecticut.

The world's largest indoor go-kart racetrack is hiding in Connecticut.

Ruins of a historic medical facility sits eerily by the water.

A former copper mine which became a truly unsuccessful prison.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

A highway marker that honors a former spy plane pilot and local hero.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

Right next to departures—how convenient!

A graveyard that dates back over 200 years stands near a busy shopping center.

This former Cold War missile control site played an important role in the creation of GPS.

A decaying garage hidden amid the dense forest is all that remains of a once-prosperous dairy farm.

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

These unusual rooms on wheels are holdovers from the 1960s.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

A small, forgotten prison cemetery marked only by a wrought-iron fence and eerie depressions left in the ground.

The system of air guns are fired off remotely to scare any trespassing avians.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.