We took the guided tour ($8) which included the tower exhibits & observation deck. Wasn't really expecting very much. I had always heard they were a very secretive group who felt morally & intellectually superior to others. Probably not that far off. But our guide (should've gotten her name) was great. Answered all questions and, believe me, our group had quite a few. The costumes upstairs were very interesting. We got lucky again with the weather. From the observation deck we could see the Capitol, the Washington Monument, and all the way down to the Potomac.