Small caves once used as a hiding place for some of those accused during the Salem Witch Trials.

A historical home in upstate New York honors the work of John W. Jones, a formerly enslaved man who was a major agent for the Underground Railroad.

This small road tunnel is the only place where you can cross beneath the Erie Canal.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

Take a trip back to the 1950s and the heyday of the road trip along Historic Route 20.

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

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

A gigantic 10-foot tall stone man.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

One patriotic farmer's ode to the 9/11 tragedy remains even after the farm changed hands.

A rusted blade sticks out from the trunk of this tree, left as a memorial to a young man who left to fight in the Civil War but never returned home.

A reproduction of a giant humanoid "fossil," a hoax buried locally for construction crews to find and gain national attention.

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

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

The final resting place of Harriet Tubman and other famous historical figures.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

The U.S. Army's giant warehouse of war art includes Hitler’s watercolors and Norman Rockwell oil paintings.

A piece of the Ludendorff Bridge, also known as Remagan Bridge, calls this military base home.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

This field of concrete was once an active defense site armed with nuclear warheads.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.