Back in the lower 48, we all added another state to our list of those visited--Washington. Along highway 155, we came upon a good dam stop: Grand Coulee Dam and visitor center. We had no idea that this was here, let alone the largest dam in North America. We wish we would have had more time, because we only scratched the surface of their visitor center. It had plenty of hands-on activities with many accessible facts about the dam and information about hydroelectricity. They also had a movie, and...if one is there at 10 o'clock at night, they can see a laser light show on the dam.