Friday: Secrets Revealed. The story of Oak Ridge’s stint as a “secret city” during World War II, explorations of light and sound and models of earth’s energy resources are highlights of the town’s American Museum of Science and Energy. Delve deeper into the history with a Department of Energy public tour, a three-hour bus excursion (offered June through Labor Day) that departs from the museum and takes visitors to Manhattan Project facilities, such as the X-10 Graphite Reactor plant and the Oak Ridge National Laboratory. “There’s a growing interest in that time in history, from the standpoint that we’re losing 1,000 people a day from the World War II generation,” says tour coordinator Fred Strohl. “I think as result of that, the Manhattan Project facilities take on an iconic trait.” Dinner is elegant yet affordable at Flatwater Grill, where menu items range from lasagna to crab cakes.