It is a great resource to begin the various museum visits. There are multiple smithsonian museums so be sure to grab a handy map from the info center located in the smithsonian castle.
The building itself is eye-catching, and is on the mall, which is a pretty central location for the history lovers! Go inside! This museum provides a good amount of history for museum buffs!
Great place to start cafe and wifi available here. Clean restrooms and maps of all sorts to start your adventure. There's people to help answer questions and also gift shops.
If visiting the Smithsonian Institute is in your list, visit the Smithsonian Castle 1st Docent tours are held 2x/day @ 9a & 1:30p. The tour give you perspective into the history of the Smithsonian.