Abdullah Khan Kala is the fortress erected by Timur's son ''Shahrukh'' in the 15th cent. The fortress was lined with mud bricks from the outside and had 44 watch towers. The fortifications were surrounded by huge moats up to 30 m wide, filled with water. In the citadel, only few walls of the palace have survived. The walls, however, are of outstanding interest, as they show the evolution of military architecture from the 5th cent. BC to the 15th/16th cent. AD.