I'll be visiting DC for a few days later this month and I'm looking for things to do in the evening. I'm not speaking of nightlife, dining and such. I mean museums, sites, etc. Everything appears to close around 5-5:30. The only things I can find are 1) walking the mall during the night, 2) visiting the National Archives on a Wednesday or Thursday evening, 3) visiting the spy museum on the weekend. Does anyone have any alternative suggestions?