16 Reasons to Explore St. Louis
The 630-foot Gateway Arch soars above downtown, reflecting sunlight and glowing different colors depending on the time of day. Insiders know to cross the grass and line up at the south entrance, which generally has a shorter wait at the security check because it's farther from the parking lot. Visitors can take a four-minute tram ride through the hollow arch legs to get a panoramic view from the top. Don't miss the free Museum of Westward Expansion below the arch (877/982-1410; gatewayarch.com).