For many years, I wondered about this seemingly abandoned and fenced off structure in downtown Concord, NH. I was told it was a gas holder house, which according to Wikipedia is a structure built to surround an iron gasholder in which gas is stored until it is needed.
One day last week after work, I stopped to make some images. The fence combined with a few trees and power lines, made getting good camera angles a trick but here is my best attempt. I also wondered what it looked like inside. These BW images are from the Library of Congress and included interior and exterior views.