Within its boundaries lies a roofless church that served the parish from at least 1622, when records show it was ‘well and sufficiently repaired’, until 1820 when a new church was built elsewhere. The site sits in a valley between Collan Hill and Carrick Hill, with a holy well dedicated to St. Mura located about 350 metres northwest along the shoreline.

The true treasure of Fahan is St. Mura’s cross-slab, an impressive stone monument standing 2.1 metres tall with a distinctive triangular top. Both faces of the slab feature elaborately carved crosses formed from broad, double-edged interlaced ribbons, creating the effect of a Latin cross mounted on a stem. The east face displays two birds with curved, crossing beaks in the triangular space above the cross, whilst small bosses with concentric circles mark each corner where the cross arms meet. Curiously, two rudimentary stone arms protrude from the slab’s sides, aligned with the cross arms on the eastern face, giving it an almost cruciform appearance when viewed from certain angles.

The western face reveals even more intricate details, with two figures standing in profile on either side of the cross stem, their long garments bearing inscriptions that have puzzled scholars for generations. Some researchers initially suggested these might be ecclesiastics, whilst others proposed they could be women, their hair falling in strands behind steep-fronted heads. The cross stem on this face expands at its base to form a platform for these mysterious figures. Along the north edge runs a Greek inscription that scholars have translated as ‘Glory and Honour to the Father and to the Son and to the Holy Ghost’, a rare example of Greek text on an Irish monument and testament to the international connections of early Irish Christianity.