The historic centre of Puebla was declared a World Heritage Site by UNESCO in 1987.
The Historic Monuments Zone of Puebla is considered the origin of Puebla. This Zone was decreed a Historic Monuments Zone in 1977 by presidential decree and 1 year later UNESCO declared it a World Heritage Site. The Historic Monuments Zone retains a lot of colonial buildings. Several of the oldest buildings were badly damaged in 1999 after the earthquake and later were subsequently repaired. Unfortunately, after the 2017 earthquake, some of them again suffered damage.