Medical Marijuana Dispensary Colorado One of the largest flat-topped mountains in the world, Grand Mesa rises above 10,000 feet and is topped by virgin forest and more than 300 bodies of water, with virtually limitless mountain-biking trails that range from mild to intense. Medical Marijuana Dispensary Colorado One of the largest flat-topped mountains in the world, Grand Mesa rises above 10,000 feet and is topped by virgin forest and more than 300 bodies of water, with virtually limitless mountain-biking trails that range from mild to intense.