Siba castle was a squared fortified structure 1000[which?] from Kukherd and on a hill above the palm oasis at southern west of Kukherd, which added remarkably to its altitude and height. The length of its interface from the south is about 114 metres, while its southern interface extends over 112.5 metres. The structure was near the monuments of ancient bath of Siba.
The history of Siba castle goes back to the Sassanid era (226–651 CE). It was the center of government of that area. It acted as fortified military base for some time and was surrounded by a huge trench for protection. A trench was an ancient defensive strategic feature to defend the cities, castles and the forts in Persia before Islamic era.
This gigantic structure was considered a traditional defensive ancient landmark like other landmarks at that time such as huge city gates, cellars, security tunnels and underground military storages. The Castle of Siba was maintained until 1163-1192. Unfortunately it was destroyed by an earthquake in Kukherd and then by a flood in 1367 which destroyed the rest of the castle.
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