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.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This former asylum for Black Americans is haunted by its history of violence and racism.

Remnants of a storybook amusement park hidden behind a strip mall.

This abandoned sea fort has become an accidental bird sanctuary.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

Once America's tallest structure, now a Baltimore landmark.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A priceless collection of the Nation's cryptologic history.

A remote horde of architectural treasures fit for Indiana Jones.

Ship skeletons haunt Baltimore's waterways.