The entrance to the castle of Neratzia is in the Hippocrates' plane tree square. You will cross a little bridge over the street of palms. The entrance fee is 3 euros and the castle is well worth every penny.
The castle was built by the knights of St John in the mid-14th century. A lot of the material to build the castle was taken from the archeological sites (including the Asklepeion). Many of the Grand Masters of the knights of St John continued the construction and added new systems to strengthen the defence until the castle fell into Turkish hands in 1523 and later in 1846 a part of it was destroyed by a gunpowder explosion and the castle was let to decline.
Nowadays it is used as a place of exhibition of sculptures, inscriptions and architectural components. The best things about this castle is that you can go nearly everywhere and explore at your own pace. The second great thing are the amazing vistas around the harbour, and the city as well as the ocean.
From the outside the castle still looks like a fortress but in the inside it is more like a ruin. There is very little explanations and signs to guide you so (like the Asklepeion) you are better off with a proper guide book if you want to get the most of the experience. There are a lot of stairs and very little shade so wear sensible shoes and bring a bottle of water with you.
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