The city is located on the flat plains of the Valley of Puebla, with Popocatépetl and Iztaccíhuatl visible to the west. Like the city of Puebla, it has a straight street grid oriented to the cardinal directions. Most streets in the center are numbered with indications as to their location vis-à-vis the center, north, east, south or west. On the city periphery, street names lose this system. In the center of this grid is the main square of the city which is called the Plaza de la Concordia, or sometimes the Zocalo. In the morning, this plaza is filled with vendors selling typical street food, sweets and handcrafted toys for children. On the west side of the plaza, there is the city hall, which was built over the former Xiuhcalli (House of Turquoise) where a council of nobles met during pre-Hispanic times. This government building is fronted by a line of businesses, which in turn are fronted by a gallery, marked by 46 arches supported by Doric columns, called the "portales." This arcade is the longest of its kind in Latin America.