I recently took a trip east to explore sites related to World War II history which I have an interest in. First stop was in Hanford, WA to take two tours of the reactors and the area that was once small towns and farm land. Both tours were excellent and I recommend them.
I drove to Wyoming to visit the Japanese Internment Camp at Heart Mountain, which is east of Yellowstone. The museum is one of the best and is worth seeing. It compares favorably with the internment camp in Manzanar, CA because you get a real sense of the unpleasant life there.