Commerce, services and tourism employs 39% of the population of San Pedro and about 35% of the population of San Andrés. Tourism is based on the city's history, with the main tourist attractions are the Great Pyramid, topped by the Nuestra Señora de los Remedios church, the San Gabriel friary and colored towers of the total of thirty seven churches in the city. Images of this church on top of the pyramid with Popocateptl in the background are frequently used in Mexico's national promotion of tourism. It is one of the better known destinations in central Mexico for foreign travelers. Commercial activity is based on tourism, local and regional needs as well as the city's active nightlife, with that of San Andrés more gear to local and regional commerce than that of San Pedro.