Mynydd y Garreg Tower

Mynydd y Garreg Tower is a circular tower in ruins, constructed from rubble stone that narrows in girth with three steps. The top of the tower appears to have been levelled off to create parapets, featuring coping stones set on edge. There is a doorway on the south side with dressed stone jambs, although the left side is mostly missing. The doorhead is absent, but above it is a dressed stone tablet that reads, "This Roman pharos was restored by Llewelyn ... Baron Mostyn in commemoration of the 60th year of the glorious reign of Victoria, Queen and Empress, June 20th 1897."

The second stage of the tower has rectangular openings on the north and northeast sides, both of which have lost their heads, although a timber lintel has been inserted above the northern opening. Between these openings on the third stage is a recess. At the top of the tower, around the northern half, are the remains of four small square openings with stone sills and lintels, some of which are missing, likely serving as lookout holes.

The doorway features splayed jambs, and the walls of the tower are very thick. On the east and west sides of the first stage, there are pairs of very deep sockets, though the opposing pairs do not align with each other. Additional sockets and recesses can be found in the upper stages, and there was formerly a staircase.