I was randomly wondering around this part of Tokyo when I saw a signpost advertising this place, I went up to the door and asked to buy a ticket and the guard said there weren't any. Although he pointed me to the convenience store across the road where I could buy a ticket. This was 10 years ago, I don't know if that place still sells tickets but the used to. It's now apparently very hard to get tickets unless you buy in advance.This place is magical, it's not a huge museum but the pack a lot in, be sure to bring a lot of money, because you will want to buy everything in the gift shop.