Colorado, a state in the western United States, has a diverse landscape that includes arid desert, river canyons, and the snow-covered Rocky Mountains, which are partially protected by Rocky Mountain National Park, which is located within the state. Mesa Verde National Park, on the other hand, has cliff houses that date back to the Ancestral Puebloans. A mile above sea level, Denver, Colorado's capital and biggest city, has a thriving downtown district that attracts visitors from all over the world.