Assabet River National Wildlife Refuge in Sudbury,...
One doesn’t expect to see them looming in the woods along the trails of a wildlife refuge. Long and low with rounded tops, they resemble ancient burial mounds or crypts. The back end of each curves down to the ground while the front has a flat concrete façade secured by a heavy iron door. A ventilation port projects from the top. Some of these structures face the trails while others stand in isolation among the trees These are concrete...

















