Pen Dinas is the site of an Iron Age hillfort dating from about 2000 years ago, on a hill which stands between the village of Rhydfelin and the coast just south of Aberystwyth. This is part of Pen Dinas and Than-y-Bwlch nature reserve which was formed in 1998 to protect the heritage and wildlife of the area. From the inland side of the harbour it's a strenuous 15 to 20 minute walk to the Wellington Memorial which stands atop the hill. The view which greets you on all sides makes the effort well worthwhile.