Marked on Ordnance Survey maps from the 1840s, this enigmatic structure occupied a raised platform of earth about 12 metres square, sitting noticeably higher than the surrounding fields near Errity in County Donegal. When antiquarian Thomas Fagan documented it between 1845 and 1848, he found what he believed to be the remains of an ancient pagan burial site, though its true nature remains a mystery.

The monument’s most striking feature was an east-west stone enclosure on its summit, measuring roughly 6 metres long and 2 to 3 metres wide. Fagan noted that this space appeared to be divided into separate grave compartments, all constructed from large stone blocks. By the time of his visit, the structure was already in poor condition; many stones had fallen or been removed, though several massive blocks remained standing in their original positions. The entire arrangement suggested something far older than the field boundaries and farms that surrounded it, leading Fagan to speculate about its pre-Christian origins.

Unfortunately, the Giant’s Grave met its end shortly before 1885, when geologist George Kinahan arrived to find that locals had completely dismantled and carted away the ancient stones. Today, nothing remains of this intriguing site except perhaps a single stone slab, about a metre across, built into a nearby fence. Whether this lonely stone once formed part of a Neolithic tomb, as some scholars have suggested, or served some other long-forgotten purpose, we’ll never know for certain. The Giant’s Grave has joined the ranks of Ireland’s lost monuments; its stones repurposed, its secrets scattered across the Donegal landscape.