Uaxact�n is located north of Tikal, in the jungles of Pet�n. Its importance lies in the fact that it is at Uaxact�n that the oldest date of the Maya Classic Period was recorded, engraved on stele 9 in the year 320 A.D. Uaxactun was also an important place for astronomical observation center, indicated by the orientation of its temples in the plaza, which is related to the appearance of the sun in the solstices and equinoxes.

The building known as the observatory has a staircase beautifully decorated with stucco masks.