Photo: Mohammed Moussa, CC BY-SA 4.0 via Wikimedia Commons
This castle perched on Pharaoh's Island just offshore was first built in 1116 AD by Baldwin I of Jerusalem, one of the leaders of the First Crusade. In 1170 it was captured by Salah El-Din ("Saladin") who rebuilt it. There were no other great battles here, and the castle was altered under Mamluk and Ottoman rule. There are boat trips to the island, hours vary with demand, enquire at the nearby hotel. Reckon US$3 for the boat and $1.50 to enter the castle.
The Castle of Saladin is located on Pharaoh's Island in northwestern tip of the Gulf of Aqaba, Egypt. The castle is composed from two parts.
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متحف طابا الكبير
Seems to have been closed since pharaonic times, but try your luck.