skull racks?

Yup, AZTEC SKULL RACKS

An illustration of Skull racks or tzompantli is shown

Skull racks were used to display the heads of sacrificed human victims.

They were called tzompantli in Nahuatl - the language of the Aztecs.

Sometimes this structure was made of stone with carved human skulls. 

Those displaying real skulls comprised a wooden framework supporting skulls skewered on horizontal poles run through holes drilled through the temples. 

Tzompantlis were first described by Spanish conquistadors and missionary friars in the Sixteenth Century. 

The Aztecs used skull racks to display prowess in war; in obtaining captives to be offered up to their gods. 

They also used them to terrorize subjugated populations.

At the Great Temple of the Aztecs (their most important temple) archaeologists found a skull rack with at least 240 carved skulls. 

They had a layer of stucco and were originally painted in red.

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