You've heard of Westworld? Welcome to Weedworld. Planet 13 is a sprawling 40,000 square-foot weed complex in Las Vegas, minutes away from the famed Strip. It's the largest dispensary in the world with 50-plus retail vendors, 70-plus cannabis strains and 42 registers. The superstore, which opened last November, serves 1,430 customers per day. The store got its celestial name because of its massive size and because the letter M (for "marijuana") is the 13th letter in the alphabet.