Arlington National Cemetery in Arlington, VA is fascinating, and not just because of the Kennedys. Visit the tomb of the unknown soldiers on a misty, foggy day. Take a peak at the memorial to the USS Maine. Or visit the ampitheatre of the Civil War dead. (If you have a family member buried in Arlington, you can get a permanent pass that permits you to drive in the cemetery -- ANYWHERE in the place. My wife's great-uncle is buried there, so her family has one -- her father and mother will be buried there as well.)

The old burying grounds in St. Johns, NB where so many of the Tories who fled the US during Revolution are buried, is another fascinating place.

One of the spookiest places I've ever been to was the battlefield at Antietam (Sharpsburg). A foggy December day, no one around, and you could easily visualize the Sunken Road or the Bridge. Ditto for Shiloh (Pittsburg Landing) on a scorching, humid day and I swear I could see the bodies at Bloody Pond.