Known as the Mound of Down, Dundalethglas, English Mount and Rathkeltair, this is one of the major earthworks of Northern Ireland, consisting of an egg-shaped enclosure, defined by a steep bank and wide outer ditch. The original entrance is on the south side away from the marsh. In the south-east part of the interior is a high, U-shaped mound with its own surrounding ditch. The large earthwork is probably a pre-Norman enclosure, a royal headquarters of the Dál Fiatach, reused as the site of an Anglo-Norman castle mound of the late 12th century, but the mound was either unfinished or later altered for artillery. The cathedral is built on a similarly fortified hill close by.
Other historic places you can visit:
