Tughrul Tower is located in the eastern side of Ibn Babuyeh Tomb in the city of Rey in Tehran. The tower has remained from Seljuk era and was registered in 1310 in the list of national monuments with registration number 147. This place is called Caliphate Yazid Tower in some scripts. The tower is about 20 meters high (regardless of the confided dome, not much of which is remaining today). According to some experts, this tower is like the arms of a clock and the time can be detected by the sun shining on its jags.