Why isn't new grange one of the seven wonders?

Newgrange, a prehistoric monument in Ireland, isn't considered one of the Seven Wonders of the Ancient World primarily because the list was determined by ancient historians like Philo of Byzantium in the 2nd century BCE, focusing on classical structures in the Mediterranean region. Additionally, Newgrange, built around 3200 BCE, predates the classical period and was largely unknown to the ancient world, lacking the visibility and recognition that led to the selection of the Wonders. Its remarkable architectural and astronomical significance has gained appreciation in modern times, but it was overshadowed by the more famous structures of antiquity.