Evergreen Waterpark and Air Museum
Yes, that is actually a 747 parked on top of that building. The evacuation doors have been outfitted with water slides leading into an indoor water park. How cool is that?! Sophia declared it the best day of her life. I can assure you it was not. Although it was pretty cool.
The Evergreen Air Museum is right next door, which houses the one-and-only Spruce Goose. That plane is so big it was impossible to get a decent picture. Here's one I found elsewhere.