The final resting place of the living embodiment of the famous Forest Service symbol.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A museum dedicated to the alleged Roswell Incident.

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

The taxidermy remains of the most popular pony in children's literature.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

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

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

Memorializing an American tragedy of massive proportions.

Steepest flood safety railway in the entire world.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

Pennsylvania's own Roswell-style UFO mystery.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

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

A Civil War Museum with some notable medical antiques.

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

One of the only memorials dedicated to journalists who died in combat.

Built by the patriotic residents of Boonsboro in a single day.

FDR's Art Deco hospital tower was hopelessly inefficient.

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

An astounding collection of medical specimens, including bits of President Lincoln.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.