Located in Boise. Completed in 1912. Dedicated to the history of the state, including potatoes. Reminds me of the Washington State Capitol...cold white marble inside. Still beautiful but seems to lack personality. It was hard to tell what you were and weren't allowed into on the self-guided tour. A lot of doors were closed and I didn't try to barge in.
Pro Tip: Guided tours require at least five people and two weeks advanced notice.