Plataforma de los Cráneos
Lonely Planet review
The Platform of Skulls (Tzompantli in Náhuatl, a Maya dialect) is between the Templo de los Jaguares and El Castillo. You can’t mistake it, because the T-shaped platform is festooned with carved skulls and eagles tearing open the chests of men to eat their hearts. In ancient days this platform was used to display the heads of sacrificial victims.