The National Society of the Colonial Dames of America is the current operator of the museum, which includes historic artifacts and displays about the building during the Colonial and American Revolution periods.
Each wall of the building boasts a large arch. The walls get thinner as they reach the top of the arch, changing from three feet thick, near the ground, to just a few inches thick near the top. There are also few doors in the building, so that in the event of an explosion, most of the explosive force would exit through the roof, with the arches acting like funnels. Sand stored in the roof would then smother and put out the fire.