A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

America's post-nuclear-attack chambers of Congress.

This tree is a living witness to the beginning of the Civil Rights Movement.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

The North Carolina grounds are leased in perpetuity to the British Commonwealth for as long as the WWII sailors are buried there.

This historic sunny-yellow building has an unfortunate connection to the sinking of the Titanic.

The time thousands of bags of chips washed ashore in the Outer Banks is memorialized in a local museum.

One of the oldest living oak trees in the Southeast.

This small memorial is almost as well concealed as Smalls himself was on the night he sailed to freedom.

Most historians agree that the so-called "Gentleman Pirate" wasn't much of either of those things.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

An abandoned coal mine reached by a steep hike.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

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

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

A once grand hotel is being retaken by the wilderness it once capitalized on.

This 19th century granite fortification is one of the most well preserved forts in New England.