At the corners of Castlekeeran Cemetery, there are three unadorned early crosses and an Ogham stone. At the Loughcrew Passage Graves, there are at least 30 graves, some of which have been excavated. Most of them date from between 3500 and 3000 BC. Cairn T, the biggest grave (37m in diameter), is decorated with concentric circles, zigzag lines and floral motifs.