Ahin Posh is a ruined Buddhist stupa and monastery complex on the outskirts of Jalalabad, dating to approximately 150–160 CE during the Kushan Empire. The Kushan period was the golden age of Buddhism in this part of Central Asia, and Jalalabad's ancient name — Nagarahara — was a significant Buddhist pilgrimage site, mentioned in the 7th-century Chinese pilgrim Xuanzang's travel account as containing relics of the historical Buddha.
The site has been excavated multiple times since the 19th century and suffered considerable damage during the decades of conflict. What remains gives a sense of scale — the stupa was substantial, with a terraced base — and the location commands a view over the Kabul River valley. It is one of several Buddhist sites in Nangarhar province that attest to a pre-Islamic cultural tradition of considerable depth in this part of Afghanistan.