The castle of Tarout, the palace of Tarout, the fortress of Tarout, the Portuguese or the castle of the Portuguese are an archaeological castle located on the top of a hill in the middle of the island of Tarut. The history of Tel Tarout who built the castle to five thousand years BC, while believed that the castle dates back to the era Alaaonah state, has the castle was one of the points defensive Portuguese in the Arabian Gulf during their occupation of Qatif after the restoration of the Portuguese in the sixteenth century on 29 March, 1544 AD corresponding to 1 Jumada I, 951 AH. The castle was restored on the temple of the Phoenician gods Ishtarot or Ishtar. The name of the island of Tarot is derived from it. Rocks and foundations of the ancient temple are clearly visible under the castle. The interior of the castle is semi-oval, irregular in shape with a total area of not more than 600 square meters, surrounded by a wide external wall constructed with mud, plaster and brush stones, supported by four towers, three of which remained and one of them collapsed during a battle. The castle is adjacent to many ancient and modern archaeological establishments, including Hammam Ain Tarout, Ain al-Odeh, Tarot Castle Cafe, Al-Kadhim Mosque and artisanal centers, ahead of the houses of Deira neighborhood as a fortress that protects these houses during battles and wars. The castle went through many periods of time and was exposed to important historical events, and went through a period of near collapse, but it was renovated in the Ottoman era, and was the last restoration in the modern era by the Saudi Ministry of Antiquities in 1984. Many of the myths and myths circulating around the castle have been shared by the people of Tarut Island as it was a gathering point for the people of the island and the focus of their conversations. Within the castle there are many statues and pottery that date back to earlier eras, including the effects of the dynasties and the era of the Obeidians and the era of the civilization of Dilmun. The citadel is currently suffering from problems such as the cracking of its towers, which threatens to fall, and the dryness of Ain al-Awda, which is located within it due to the continuous oil withdrawal, as well as the lack of official opening for visitors and tourists and close it to any visit. The castle has visited many foreign missions including the Danish mission and the researcher Jeffrey Pepe.