<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by markbach:
Assuming you're talking about the D&B in Bethesda, there's a metro stop right there, but doesn't the metro stop running about 1 on weekends? That would mean those staying out in Virginia would have to leave by about 12. 
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The Metro is now open until 2 on weekends. If you leave at 1:15, you should be just fine.