Situated in the Southwest corner of America, Tucson might seem overshadowed by its bigger brother Phoenix to the north. While both great Arizona cities are located in the Sonoran Desert, Tucson might be the unofficial capital. For starters, it’s right smack in the middle of the region, and it’s home to sacred Saguaro National Park, which National Geographic once named the “Greatest National Park in America.” That’s a big deal in this rare subtropical desert that sustains millions of giant green cacti with the help of two annual rainy seasons.