Toghrol Tower in Rey city is a 12th-century monument where Seljuq ruler Tugrul Beg (990 – 1063) is buried. The 20-meter tower is built of bricks and once had a dome, which was destroyed in an earthquake. A flight of stairs inside this cylindrical tower connects its lower level to the higher one. The tower also functions as a sundial. It is said that a number of other prominent Seljuq era figures have been buried in Toghrol Tower.