Colorado's second-largest city boasts breathtaking views and some of the best outdoor recreation. This city is worth its weight in gold, making the Gold Rush pioneers' "Pikes Peak or Bust" slogan resonate for today's visitors as well. Those who love fresh air won't run out of things to do in Colorado Springs. Tourists can explore the Garden of the Gods and Royal Gorge Bridge and Park. Or make a visit to Cheyenne Mountain Zoo, the only mountain zoo in the country. Railroad buffs can ride to their hearts content on the Pikes Peak Cog Railway, Royal Gorge Route Railroad, and Cripple Creek & Victor Narrow Gauge Railroad. Flights to Colorado Springs land at Colorado Springs Airport, 20 minutes from downtown.