You can't miss the sight of the impressive Gateway Arch when driving through St. Louis, and you certainly shouldn't miss the chance to see the city from the top of this architectural masterpiece. Designed by Eero Saarinen, this 630-foot monument commemorates the Western expansion of the United States. After snapping some creative shots from underneath the Arch, be sure to head indoors for tickets that will take you to the top in small pods specially designed for the curvy ride up. We recommend arriving as early as possible or booking tickets in advance to avoid long lines. Tram tickets are $10 for adults (16 plus) and $5 for children ages 3-15. While waiting for your scheduled tram departure, check out the exhibits at the free Museum of Westward Expansion. The diary entries written by Lewis and Clark are especially eye-opening. The Arch also shows two films daily: "Monument to the Dream" and "Lewis and Clark: Great Journey West." Film tickets are an additional $7 for adults and $2.50 for children. The Museum Store carries a wide selection of books, posters and Arch souvenirs.