Climbers in Colorado often have to hike for miles to find frozen waterfalls to scale. At the Ouray Ice Park, all they have to do is walk down the street. Located in the southwestern Colorado hamlet of the same name, the manmade Ouray Ice Park features more than 200 ice and mixed routes up the walls of the Uncompahgre Gorge, a steep canyon that cuts right through town. Every January, the park holds the world's best-known ice-climbing festival, a four-day affair whose competition draws some of winter climbing's top athletes. The park is free to the public, though gear rental will still cost you; San Juan Mountain Guides (ourayclimbing.com) teaches lessons for beginners.