 As of 2018, there are thirty-five World Heritage Sites in Mexico, including twenty-seven cultural sites, six natural sites and two mixed sites.The country ranks first in the Americas and seventh worldwide by number of Heritage sites.Mexico's first six sites, Sian Ka'an, Pre-Hispanic City and National Park of Palenque, Historic Centre of Mexico City and Xochimilco, Pre-Hispanic City of Teotihuacan, Historic Centre of Oaxaca and Archaeological site of Monte Albán, and Historic Centre of Puebla, were inscribed on the list at the 11th Session of the World Heritage Committee, held at UNESCO headquarters in Paris, France in 1987.