Colorado covers most of the southern Rocky Mountains and the North-Eastern region of the Colorado Plateau, as well as the western area of the Great Plains. The state’s capital is Denver, which is also Colorado’s most populated city. The area’s main port of entry is Denver International Airport which is the 13th busiest in the world. Colorado is well known for its beautiful landscape of mountains, forests, rivers and desert. Hiring a car in Colorado means that you can visit some of the state’s most popular attractions which include Denver Art Museum and Denver Museum of Nature and Science.