Tourists visit the Pyramid of the Sun, about 40 kilometers north of Mexico City, capital of Mexico, Jan. 27, 2008. According to a recent report of a Mexico tourism association, the total tourism revenue of Mexico in 2007 reached a record of 12.979 billion U.S. dollars, which was 6.6% more compared with that in 2006. Moreover, Mexico has received 21.5 million foreign visitors person-time in 2007. Tourism is the third foreign currency resource of Mexico. (Xinhua Photo)

Tourists choose local knitwear at the Pyramid of the Sun, about 40 kilometers north of Mexico City, capital of Mexico, Jan. 27, 2008. (Xinhua Photo)

Tourists choose handicrafts at the Pyramid of the Sun, about 40 kilometers north of Mexico City, capital of Mexico, Jan. 27, 2008. (Xinhua Photo)

Tourists climb the Pyramid of the Sun, about 40 kilometers north of Mexico City, capital of Mexico, Jan. 27, 2008. (Xinhua Photo)

Tourists climb the Pyramid of the Moon, about 40 kilometers north of Mexico City, capital of Mexico, Jan. 27, 2008. (Xinhua Photo)

Tourists take photos after climbing the Pyramid of the Sun, about 40 kilometers north of Mexico City, capital of Mexico, Jan. 27, 2008. (Xinhua Photo)

(Xinhua News Agency January 30, 2008)