I took this photo at Fort McClary in Portsmouth, New Hampshire. It’s the bottom of the stairs that lead to the caponier.
What’s a caponier?
It’s a defensive outcropping of a fort. Typically it will have several rifle ports from which defenders can prevent an opposing force from storming the walls of the fort. This caponier has an arched brick ceiling covered by earth and grass. The floor was paved with asphalt, as Fort McClary is now a tourist destination.
It’s pretty dark in there, even in the middle of the day, so I was able to get a few moody photos. This was my favorite, but if you like your caponier stairs more cheery, you can always use this image:
What a difference a few degrees angle makes!