Part of the Shush Castle, a monument located near Susa in Shushtar in Khuzestan Province, has collapsed.
Heavy rains have caused the destruction of the ceiling of the caretaker's house in the castle, the Khuzestan Cultural Heritage Lovers Society (Tariana) spokesman Mojtaba Gahestuni told the Persian service of the Mehr News Agency on Saturday.
"Rain gutters on the monument were inadequately installed about three years ago. The windows were removed from the castle two years ago and never replaced with new ones," he added.
"Thus, the castle has been left without any appropriate safeguards," Gahestuni lamented.
Experts have previously warned about natural environmental factors such as heavy rainfall and strong winds causing serious damage to the castle.
The construction of the Shush Castle, which is currently a storehouse of many ancient Iranian inscriptions and artifacts, began on a hill in 1897 by the French civil engineer, geologist, and archaeologist Jacques Jean-Marie de Morgan.
Originally, the stronghold was built to shelter De Morgan's archaeological team and a place to carry out their studies.
Last week, another report announced the collapse of the historical bridge of Gargar in Shushtar because of heavy rainfall.
The bridge is one of 13 parts of the water system, which has been registered on the UNESCO World Heritage List in 2009.
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