The setting sun was rising on the facade of Catredal de Puebla. 1 of 3. The facade is known for its grey quarry stone and the bell towers that are among the tallest in Mexico, At over 70 meters tall, it was once the tallest church in the Spanish colonies. The north tower, which holds the bells, was finished in 1678. It's also called the Old Tower. The south tower was built later, in 1731, and opened in 1768. The cathedral is located on the southern edge of the Zocalo de Puebla but has its side doors instead of its main doors facing the plaza. The current cathedral was built between the 16th and 17th centuries. It replaced an older church that stood in the same spot. It took 74 years to build, from 1575 until its dedication in 1649. The main entrance, called the Puerta del Perdón (Door of Forgiveness), was finished in 1664. The cathedral compliments the 1987 Puebla designation as a UNESCO World Heritage Site.