Luana
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This fortress, also called Kale, sits atop a hill and offers the best panoramic views of the city and the river. Entry is free, which is great. The walls are of Byzantine origin (6th century) and were expanded by the Ottomans. You can walk along large parts of the walls, which makes for incredible photos. The terrain inside is a bit uneven, so it's good to wear comfortable shoes. It's well worth it for the view and the history.