Thousands of pilgrims have flocked to the Pyramid of the Sun at Teotihuacan, Mexico, to hail the first rays of sun of the spring equinox.
The visitors believe the ancient structure holds a special energy at the equinox which they can receive...
... especially if they are dressed in white.
Perfomers in Aztec costume join the ceremony, to perform dances as part of the ritual.
More than 1,500 federal soldiers have been sent to ensure the revelries don't get out of hand.
The site also houses the Pyramid of the Moon, which is older but not as high.