I tried to do research on this but I don't have a definite solution to this. I really wanted to take pictures at the Lincoln memorial at night, at least. But I find no parking near it. I see one just south of Jefferson memorial but I don't know if that is 24hrs parking and how long of a walk. I am also concern about DC having the highest crime rate in america. I really don't want to walk at night because I have a kid and my parents coming along. Your input is appreciated.