The building in my back yard
It's about 30'x30' and 12' tall, made of concrete block and buried in the ground. Only one side is above grade where it opens to an alley. I thought about building a new 12' wall inside the door about 10 feet and putting a viewing window in. Seal the inside and fill the sucker with water. LOL. It would be roughly 53,784 gallons.
Yeah, never gonna happen.
Like this: