I'm currently visiting my mum in the US as she's working over here at the moment. She leaves next Friday morning (works on cruise ship) however I will be flying out at 10pm Saturday from Baltimore airport. There doesn't seem to be much to do in Baltimore and I would really like to visit Washington however there seems to be a lot to see and do given I only have 1 maybe 2 days there. This is complicated by the fact I already have a hotel booked near the airport for Friday evening so I would have to travel there each day (seems pretty easy as there is a direct train from the airport to union station). Has anyone here ever been there or live near there and could recommend the best places to visit while I'm there?