 Present-day crenellated walls date back to the late 17th century and attain the height of 10 meters.Kalta Minor, the large blue tower in the central city square, was supposed to be a minaret, but the Khan died and the succeeding Khan did not complete it.The old town retains more than 50 historic monuments and 250 old houses, mostly dating from the 18th or the 19th centuries.