This is a 16th century fortress that overlooks (protected in older days) the harbor. Free to walk around and houses a couple of museums (fee) and shops. Old canons still in place. Worth seeing if you are in town.
We really enjoyed our visit here. There's so much to see and it's all free. The staff are friendly and very helpful. One would need at least two hours to see everything. There's also a beautiful terrace garden with great views of the harbour.