I do not believe so. Just show up. They do limit tour group size. There may be a wait. Just mingle with people and check out the history/museum exhibits. The wait is worth it for sure.
Free to take a tour, but if for whatever reason they are busy, they may ask you people to hang around for the next tour. Doesn't happen often though and they don't have a way to book ahead of time.
We walked right in, free tour. Great place
We did. They give you a ticket. It's free to sign up
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