I have never experienced anything paranormal here or logged any activity, but our last two visits here seem to indicate this area may becoming active, like the commandant's house.
The first mention of this structure was in an 1875 Annual Report - "The construction of the torpedo casemate has commenced." (http://en.wikipedia.org/wiki/Fort_Mifflin)
What we have documented in the Torpedo Magazine appears here:
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Although we have held events at the Fort and continue to support it, we are not affiliated with Fort Mifflin.