There are remains of ancient Iron Age hill forts on the hills in Briton Ferry at Warren Hill; above the town, they are found at Buarth-y-Gaer, Gaer Fawr, and Mynydd-y-Gaer alongside the boundary with Baglan. A Neolithic stone is in place within the grounds of Cwrt Sart school. A plaque alongside the stone is inscribed, When removed, it will speak but once to reveal its secret, and then remain silent forever. One explanation for the name of the nearby Giant's Grave is the presence of a cromlech. At Crymlyn Burrows, an unlooped Bronze Age axe (c.1400 BC) was discovered.