I went to the Anne Frank house. It was some years ago though. It was in August or September and we didn't make reservations. We just went. There may have been a line, but we got through it in a reasonable amount of time. It was really interesting. They let in about 20 people at a time, staggered about 5 or 10 minutes. It is really squish. A bit like moving a herd of cattle through back alleyway. But it was worth the wait and awkwardness. I purchased some things from there, unfortunately, I got all that stuff stolen as I was walking around afterwards. That being said, I loved Amsterdam.