Cliff Palace ruins at Mesa Verde National Park in southwestern Colorado's Montezuma County. https://www.rawpixel.com/image/582475/carol-highsmiths-colorado-photographFree Image from public domain licenseA portion of the Cliff Palace ruins at Mesa Verde National Park in southwestern Colorado's Montezuma County. https://www.rawpixel.com/image/582469/carol-highsmiths-colorado-photographFree Image from public domain license