People may not know that grapes are produced in Namhansanseong Fortress. However, since Namhansanseong Fortress is surrounded by mountains in all directions and has less rainfall due to its higher elevation, it is one of the best areas for cultivating grapes. Namhansanseong Fortress grapes contain much sugar, yielding a very high quality all around. Since all output is directly picked and sold to tourists, the tourists who visit Namhansanseong Fortress from August to September can taste fresh grapes. Namhansanseong Fortress grapes draw a positive response from those who taste them.