When visitors think of St. Louis, the iconic 630-foot-tall Gateway Arch comes to mind. But the world's tallest arch, a monument symbolizing the westward expansion of the U.S., also serves as a gateway to embark on fun adventures in this magnificent Missouri city situated near the confluence of the mighty Mississippi and Missouri rivers, where Lewis and Clark once explored and resplendent riverboats reigned. Grab a brew and food at the bustling Ballpark Village entertainment district and catch a Cards game at Busch Stadium. Enjoy the thrills and spills of Six Flags St. Louis. Explore the St. Louis Zoo, known as America's top free attraction. Other must-see sites include Forest Park, one of the nation's largest urban parks; the Anheuser-Busch Brewery; the City Museum, a quirky playground for all ages; and the Missouri Botanical Garden, the oldest in the nation.