Even the most jaded teen will be wowed by the colossal busts of Washington, Jefferson, Roosevelt, and Lincoln at this national park in the Black Hills of Keystone. The visitors' center has exhibits on the 14-year journey to complete the monument, which was finished in 1941 after 400 workers dynamite-blasted the granite peaks to carve the faces. There is also info on how the four great leaders depicted guided our nation through tricky times. Stay for sunset to sing the National Anthem at the lighting ceremony, and challenge your kids to count the number of different state license plates in the parking lot. While you are in the area, make time to see the Crazy Horse Memorial, another enormous cliff carving in the making about a half an hour southwest of Mount Rushmore. 13000 Highway 244, 605/574-2523, nps.gov/moru. Free; parking permit, $11.