Mexico's capital city is an ancient gem. The city center is focused near the Zocalo (Plaza de la Constitucion) and the historic Aztec Templo Mayor, can be found here. The Zocalo is the largest square in Latin America and the third largest in the world. Located in the state of Quintana Roo on the Yucatan Peninsula in Mexico, Cancun is a tourist's paradise. Everything in Cancun is perfect for the young-at-heart vacationer: the soft sand, the aquamarine Caribbean ocean, the fashionable hotel resorts, the tequila-drenched parties and the history-packed Mayan ruins."