Although it is housed on three floors, the actual exhibits only take up one floor. After waiting in line for 30 minutes for tickets, my three year old only spent the same amount of time in the exhibits. My biggest beef is that the gift shop does not have their own cashier. After spending time choosing a couple of toys, I was told I would have to go to the end of the admissions line to make my purchase. Sorry, but I'm not waiting in line another 30 minutes to buy two items that I can find at any other toy store.