I have visited numerous penguin exhibits in my life and it is without a doubt the best that I have ever seen. It is entirely outdoors, huge in comparison to many others of similar design, and the winding, rocky coastline of South America is accurately replicated in Seattle. I must point out that I have never visited the St. Louis Zoo, and many people hail that penguin exhibit as being perhaps the best in North America. A pair of other excellent penguin enclosures (both indoors) can be found at the Indianapolis Zoo and Omaha's Henry Doorly Zoo.