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

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

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

At 207 feet, one of the world's longest continuous escalators.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The "lovely red Vega" of the legendary record-settling pilot.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

The land is home to swimming ponies and a legendary 18th-century treasure.

The last bastion of Roman presence north of the Alps looms over a German town.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

This dramatic rail curve was once the target of a failed Nazi attack.

Outsider art meets paleontology at this roadside reptile repository.