The Gunbad-i-Qabus tomb is in the north of iran by the Caspian Sea. it is regarded as the most influential 11th-century tomb tower, and one of the first buildings in Iran associated with the Central Asian Turks. it is a cylindrical brick tower, tapering to a height of 51m, dtrengthened by ribs and topped with a perfect onical roof. in plan it is a ten-sided star. the tomb exterior is remarkably plain. two bands of inscriptions, and the two pendentives overhanging, curved, triangular surfaces that support the tear-shaped half-dome above the entrance are the only ornament on an otherwise unadorned brick facade.