Summary:

- Archaeologists have discovered evidence of a complex ritual practice in Iron Age Spain involving the display of severed human heads, suggesting a more sophisticated social and religious system than previously thought.

- The ritual involved nailing the severed heads of individuals to wooden structures, likely for public display, and the analysis of the skulls reveals that the practice was not limited to enemy combatants but also included members of the local population.

- This discovery provides insights into the social and religious structures of Iron Age Iberian societies, challenging the notion of a simple, violent culture and suggesting a more nuanced understanding of their beliefs and practices.