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

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

World's first "penitentiary," meant to be humane, drove men insane.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

The only recreation of William Shakespeare's indoor playhouse.

The United States Capitol's former columns still stand.

Art deco landmark on the outskirts of Washington, D.C.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.