My brother is a recent aerospace engineer grad so we stopped by the building to see the displays and visit the gift shop for some cool souvenirs. Then someone let us know about the library on the east side of the building. We went and the staff was so friendly and enthusiastic! They gave us a short tour and then had tons of FREE books, stickers, posters, notebooks, etc and told us to help ourselves. My kids LOVED the things I brought back for them. This was a fun, unexpected experience in DC and I highly recommend it!