"Its massive size, centrality to daily life in the capital, and easy accessibility (a Metro station opens up right onto the plaza) makes the Zócalo an ideal place for large-scale temporary exhibits. The government hosts occasional exhibits and makes entry free for residents and visitors alike. Past exhibits have included Gregory Colbert's "Ashes and Snow," a show of large-format photos of animals and people, and Willy Souza's " Mexico en tus sentidos" (" Mexico in your senses"), lush, vivid photos of people and places around Mexico. To see if a show is planned during the time you'll be visiting, check the website of the Secretary of Tourism."