The Sahat-kula (Clock Tower) stands near the Gazi Husrev-beg Mosque complex in Baščaršija, a square stone tower with a distinctive Ottoman clock face. What makes it extraordinary is not its architecture but its timekeeping: the clock displays lunar time, in which noon is marked at sunset rather than midday, and the time must be adjusted every day relative to the sun. It is thought to be the only public clock in the world still operating on lunar time.
The tower dates from the late 16th or early 17th century. It is not open for visits inside, but the exterior is easily seen during any walk through Baščaršija. Standing in front of it while the time displayed bears no relation to your phone is a mild but genuine moment of disorientation — a reminder that time-keeping is a cultural convention as much as a physical fact.