After St Louis-------go southeast to Nashville( Grand Old Opry) then I65 North to Bowling Green for Corvette musem and factory tour, Louisville (couple whiskey places enroute) on north to Indy for Indy 500 museum, east to Dayton for Air Force Museum, north to Detroit area, enter Canada to Niagra Falls( both sides)or Detroit back down and around lower side of Lake Erie to Niagra Falls, then southeast toward Washington area( I'd go toward Pittsburg from the falls then Gettysburg and then on to DC area ( some monuments /museums ya just gotta see ) a little further south to Richmond and then east to the coast line down by Newport News and Norfolk then rt 13 across the bay and along the coast ( After the first of September will not be too crowded) toward Atlantic City and then inland toward Philly( Liberty Bell) then on up toward the New York and beyond------