Witold Skrypczak Getty Images

The 17th-century Iglesia de Jesús is also called Iglesia de la Tercera Orden. Built by Jesuits in 1618, this is the sole surviving edifice from a complex of buildings that once filled the entire city block. The church was built from the stones of a destroyed Maya temple that once occupied the same site. On the west wall facing Parque Hidalgo, look closely and you can see two stones still bearing Maya carvings.