Designed by famed architect I.M. Pei, the pedestrian promenade is made of red, white and gray granite in a repeating pattern that, seen from above, resembles the skin of a diamondback rattlesnake. Free shuttle buses travel up and down the 16th Street Mall, stopping on every corner. There are 42 outdoor cafés along the mall and the Denver Pavilions is a shopping and dining complex with 12 movie theaters and more than two dozen shops and restaurants.