Not sure we didnt have any problems with the tour's i would recommend the Grand tour
It tells how many slots are still open. We've been there twice and both times have just gotten tickets when we walked in for the next available tour. You could always check online and see if it seems to be selling out. If it's not too full it would be my recommendation to just get them when you arrive. You are in for a treat. It's a really interesting place to visit!
It's how many tickets are still available. Have fun...its a great experience.
I believe it's available.
Thanks! Your answer is awaiting moderation.