Air Force Museum - Dayton

Steve’s take

The largest and oldest military aviation museum in the world, and it's free. Free. Four hangars full of planes from the Wright Brothers era through stealth bombers. You can walk through a B-17, sit in a cockpit, and see the only remaining XB-70 Valkyrie — a plane that flew three times the speed of sound. Your kids will run through the hangars like tiny fighter pilots. Budget two hours minimum. This is arguably the best free museum in America and it's sitting right off I-75 in Dayton.