Pretty late for the OP, but I'll weigh in, anyway. I'm sort of a nerd over the Manhattan project history. So I recommend going to Oak Ridge and the museum there. There is also a small display of MP history at the visitor's center of the Oak Ridge plant.
Among the displays at the main museum in town, is a manufactured house produced for the plant workers. Oak Ridge went from a few hundred people to 50,000 people almost overnight. Amazingly, several of the "temporary" houses are still in use. If anyone cares, I can give you the general area to see them.
Check with the museum in town, they run tour buses that take you onto the Oak Ridge plant site to visit a few of the WWII sites. It's pretty much impossible to see these sites otherwise.
Pretty area. My photo below was from Frozen Head State Park northwest of Oak Ridge.