There is an open darkroom at the Glen Echo Natl Park, off MacArthur Blvd in Glen Echo, MD. It is run by an organization called Photoworks. The open hours are on Sundays and Mondays; the rest of the time, the darkroom is being used for workshops. The fee is $6.00/hour. I have found the people to be nice, but the users' skills will be varied, so you have to watch your stuff.(posted 8474 days ago)I'm having trouble putting my hands on Photoworks phone number right now, but if you have trouble finding them, e-mail and I'll scrounge a little harder.