A cross country photographic journey could take a long time to get to Alaska! I am envious!
Every state has parks to see. You will be crossing the continental divide, very photogenic. The black hill of the Dekotas is on my list. Yellowstone could take a liftime to photograph. The rockies are hard to miss. The snake river has it's own mystic panaramas. There is the columbia river. The volcanic mountains of St Helens and Hood are close to each other. wildlife alon the Pacific North West coast could take a while. Almost every typography is between Ohio and Alaska.
You may want to notify those in Alaska that you may be a while!!!