thick walled structure.
When I was in a Navy school in Newport in 1979 I explored the "redoubt" for Ft. Adams, which was surrounded by old officer's quarters. No one had attempted to restore it at that time, and the muddy tunnels were either filled with water or the open places were still littered with fragments of clay pipes. One thing I really wanted was a fortress-like wooden door with iron reinforcements all over it, it was about 4"thick and way to heavy for me to manage (old days before I learned how to move heavy stuff.) So I left it there, fortunately for later restorers. The CINC wasn't very tolerant of such things back then and I probably would have wound up taking it back there anyway. Now however she's just numb to it all (well-trained!)
