At the corners of Castlekeeran Cemetery, there are three undecorated early crosses, which pre-date the scriptural crosses of Kells, 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 2500 and 2000 BC. Cairn T, the biggest grave (37m diameter), is decorated with concentric circles, zigzag lines and floral motifs.