Human activity in the area dates back to 5000 BCE. The first traces of civilization on the hill date from the Bronze Age, while the ceramics found on the place date from the Early Iron Age, as well as the impressive round altar, almost 2 m in diameter, hewn out of the rocks.

Archaeologists have uncovered a giant multi-story palace and an imposing fortress built around the hill, with walls as thick as 2.8 m. This dates from the time of the Roman Empire. Temples and residential quarters were also constructed in the fortress. The megalithic complex has been laid in ruins and re-erected many times throughout history.

https://en.wikipedia.org/wiki/Perperikon