Allt-yr-Esgair Iron Age hillfort
Allt-yr-Esgair is a hill with panoramic views of the Usk Valley to the west and south and across Llangorse Lake to the Black Mountains to the northeast.
In Welsh, Allt-yr-Esgair means wooded slope of the ridge. Locally, the hill is known as The Allt.
The summit (393m) is crowned by a hillfort presumed to be of Iron Age origin, one of several in the Usk Valley. The Roman road that links the Roman fort of CICVCIVM at Y Gaer, Brecon and Gobannium at Abergavenny runs along the ridge.