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Tourism in Mexico is a very important industry. Since the 1960s, it has been heavily promoted by the Mexican government, as "an industry without smokestacks." Mexico has traditionally been among the most visited countries in the world according to the World Tourism Organization, and it is the second-most visited country in the Americas, after the United States. In 2017, Mexico was ranked as the sixth-most visited country in the world for tourism activities. Mexico has a significant number of UNESCO World Heritage sites with the list including ancient ruins, colonial cities, and natural reserves, as well as a number of works of modern public and private architecture. Mexico has attracted foreign visitors beginning in the early nineteenth century, cultural festivals, colonial cities, nature reserves and the beach resorts. The nation's temperate climate and unique culture – a fusion of the European and the Mesoamerican are attractive to tourists. The peak tourism seasons in the country are during December and the mid-Summer, with brief surges during the week before Easter and Spring break, when many of the beach resort sites become popular destinations for college students from the United States.