Is Fort Mifflin haunted?
http://philadelphia.metblogs.com/archives/2007/03/is_fort_mifflin.phtml

Is Fort Mifflin haunted?
posted by jen kardux

A better question for many people might be, what is Fort Mifflin?
Commissioned in 1771, Fort Mifflin or Mud Island Fort was built by the
british, then taken over by the colonies. In early October of 1777 400
soldiers held off a siege by 2,000 redcoats, allowing General Washington
to escape to Valley Forge. The fort was rebuilt between 1798-1800 and
remained a military post until the 50's. For more of the dry historical
details, check out wikipedia.

Now, the good stuff. The longest reported ghost is that of the
"Screaming Woman,' Elizabeth Pratt. It is said that the officer's wife
hung herself after her daughter died of typhoid fever, and her screams
still haunt the Officer's Quarters.

The blacksmith shop is supposedly still haunted by Jacob, the resident
worker who had many problems with the doors. Then there is the very
helpful guide in revolutionary garb said to be found near the power
magazine. Apparently, he will give you a top-notch tour of the fort, if
you don't mind a ghost guide.

Finally, the best known haunting is that of Billy Howe in casemate 5. He
was a prisoner during the Civil War, convicted of murder and hung in the
courtyard.
A few years ago Rodney Anonymous of The Dead Milkmen Fame, attempted to
spend the night in casemate 5. He detailed his experiences on his web
site in a section entitled
"A Bad Night at Fort Mifflin." He includes some audio, as do the folks
at Moorestown Ghost Research, who visited the fort three times.

Interestingly enough, this casemate 5 was hidden for over 100 years and
just discovered last year by the caretaker! Check out photos of the
casemate in a slideshow on the myspace profile.

It seems most visitors, particularly those at night, agree Fort Mifflin
is most certainly haunted. The site opens April 1 for tours, and there
are special ghost tours every year around Halloween. Why not go find out
for yourself?