Boulder, Colo., is one of the most well-known climbing destinations in the U.S. It stands out from Colorado's other mountain towns thanks to its climbing culture. One of the best climbing spots in Boulder frames the city skyline. Dubbed the Flatirons, these imposing slabs of rock offer a few kinds of climbing experiences. Novices who just want a taste of climbing without roping up can take some scrambling routes up the sides of the Flatirons, while other routes require ropes and basic climbing skills. Boulder also has climbing schools that can help prepare beginners to take on Flatirons-like climbs, while others take advantage of Boulder's proximity to the Rockies to offer hands-on alpine experiences for those who eventually want to reach some snow-capped Rocky Mountain summits.