services at 18% both related and not to tourism. This is an increase from 45% in 1970. Since the 1990s, the state has promoted its tourism industry, with attendance at international forums, and building of hotels and other infrastructure. The Centro de Congresos (Convention Center) of Quer�taro was inaugurated in 2011 to attract more business travel to the state. The facility contains ten halls, with a capacity of 9,000 people.
There are two areas declared as historic monuments by the Mexican federal government, the historic center of Quer�taro and the historic center of San Juan del R�o. The historic center of Quer�taro has been declared a World Heritage Site by UNESCO. Most historic and cultural attractions are located in the capital. Museums include the Museo de Arte de Quer�taro, the Museo Regional de Quer�taro, the Museo de la Ciudad, the Museo del Sitio de Quer�taro and Museo de la Matem�tica. Outside of the capital, there are the Museo Hist�rico de la Sierra Gorda, Museo Arqueol�gico y Minero de la Sierra and the Museo de la Muerte in San Juan del R�o. Another major attraction is its 74-arched aqueduct built in the early 1700s. The aqueduct rises 23 meters (75 ft) above street level and conveyed drinking water to the city from regional springs until 1970. The founding of the city of Quer�taro is celebrated in July with various cultural and gastronomic events. Conchero dancers go in procession to the La Cruz Church to commemorate the appearance of Saint James.
Quer�taro has a number of areas which lend themselves to ecotourism. One area especially promoted is the Sierra Gorda region. The area is a complex of canyons and mountains extending over 400,000 hectares with a well conserved biological diversity. In the deep canyons there are grottos, valleys, ravines and arroyos. In the higher areas there are forests of pines and holm oak, and tropical forests in the lower elevations. The area was declared a biological reserve and contains about 1,700
