When the Queen doesn't feel like staying in her normal palace, Windsor is where she goes to relax. When the castle is empty of royals, part of the castle open to explore. Very cool! no pictures allowed inside the castle, but it was the fanciest place I've ever visited (gold on gold on gold).
It was pretty fun to be in a spot where EVERYONE was a visitor, so we could totally embrace our tourist-ness and not feel out of place. There was a lovely free audio tour that we enjoyed, even though Cary's accidentally got set to the "visually impaired" tour... hahaha we didn't realize until the very end. I couldn't figure out why he was taking twice as long in every room, thought maybe he was just really soaking up the history! :)