Since 1996, the guided bus tour includes highlights of the history of Oak Ridge and how it became a Secret City of 75,000 people with a mission to end World War II. Sites visited include Y-12 New Hope Visitor Center, Bethel Valley Church, Graphite Reactor at ORNL Spallation Neutron Source (one of the four DOE sites in Manhattan Project National Historical Park), Heritage Center (formerly K-25) and K-25 Overlook.

Bus tour registration is offered online at their website, amse.org/bus-tours/.