Dancers perform during a traditional spiritual ceremony among the ruins of the pre-Hispanic city of Teotihuacan, 60km (37 miles) north of Mexico City, March 21, 2009. Hundreds of Mexicans and tourists gather at Teotihuacan every year to welcome Spring at the Pyramid of the Sun.

　　People climb up the Pyramid of the Sun located in the ruins of the pre-Hispanic city of Teotihuacan, 60km (37 miles) north of Mexico City, March 21, 2009. Hundreds of Mexicans and tourists gather at Teotihuacan every year to welcome Spring at the Pyramid of the Sun.

　　People climb up the Pyramid of the Sun located in the ruins of the pre-Hispanic city of Teotihuacan, 60km (37 miles) north of Mexico City, March 21, 2009. Hundreds of Mexicans and tourists gather at Teotihuacan every year to welcome Spring at the Pyramid of the Sun.

　　A girl is held up towards the sun among the ruins of the pre-Hispanic city of Teotihuacan, 60km (37 miles) north of Mexico City, March 21, 2009. Hundreds of Mexicans and tourists gather at Teotihuacan every year to welcome Spring at the Pyramid of the Sun.

　　A woman raises her arms to receive energy from the sun among the ruins of the pre-Hispanic city of Teotihuacan, 60km (37 miles) north of Mexico City, March 21, 2009. Hundreds of Mexicans and tourists gather at Teotihuacan every year to welcome Spring at the Pyramid of the Sun.