I was going to suggest Tyson's or somewhere in Nova, but, it is close to Montgomery. If you take a look at the Washington DC ad board, there, you will see the different locations providers have selected. It is a bit expensive if you stay in DC, but, if you book in advance, you can literally save hundreds and hundreds of dollars.
It's just a suggestion. There ain't too many other places around here besides Baltimore. Those areas listed are what providers chose because more clients tend to frequent those ares. Anyhow, I wish you best of luck!