This was the Lorton Reformatory, a prison that housed the more serious offenders for DC, including women involved in the Suffragette movement. This is actually where the “Iron Jawed Angels”, Alice Paul and Lucy Burns, were held as well.
It was abandoned a few years ago and left sitting for a while… then, just last year, they began rebuilding it into an arts center. A kind of co-op: http://www.lortonarts.org/
We visited the galleries and watched the artists working in their spaces, but I really enjoyed seeing all of the spaces that haven’t been rebuilt yet. You can see the abandoned sections here: