Saguaro National Park is named after the giant cactus that are native to the Sonoran Desert. These impressive plants live as long as 150 years or more, and may take between 75-100 years to grow their first arm (if they grow one at all!).
This minimally visited park is located just about 2 hours south of Phoenix, yet it only draws around 800,000 visitors each year. Sure, this park is relatively small (just over 91,000 acres) and easily ranks in the bottom-half of parks by size. Though this park lacks in size, there is a great deal to do and explore.