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

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

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

The trials and tribulations of marking Poe’s grave.

The summer home and later final residence of acclaimed American sculptor Augustus Saint-Gaudens.

The author of Uncle Tom's Cabin was neighbors with Mark Twain while living in this Connecticut home.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Memorializing an American tragedy of massive proportions.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

An Irish Memorial commemorating those who perished due to potato blight.

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

This historic old movie house was the scene of one of the Blob's most iconic attacks.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

This elaborate towering structure was once famed for its revolutionary height.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

Yo, Adrian!

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

The world’s first penitentiary, meant to be humane, drove men insane.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.