You can easily spend all day here. There are a lot of exhibits, a 4-D movie, several films and interactive things to do. My wife and I were here about 4 hours and could have spent that much more. Your ticket allows you to come back the next day, but we were leaving town early the next morning. I recommend you watch the orientation movie at the beginning. It is helpful. Although there a lot of interesting exhibits, among the best are the 3-story guard tower from the Berlin Wall, the antennae from the top of the World Trade Center, and the Unabomber's cabin.