Tugrul Tower, which was built in the 12th century CE, is located in the city of Rey, south of the Iranian capital.
The 20-metre tall brick tower is the tomb of Seljuk ruler Tuğrul Beg, who died in Rey in 1063. Originally, like other monuments of its time, it was capped by a conical dome, which would have added to its height. The dome collapsed during an earthquake.
Here are Tehran Picture Agency’s photos of the tower: