It's somehow impossible to visit Yazd and do not see this place.
Amir Chakhmaq , the 15th Century three-storey façade located in the centre of Yazd, is a fine example of many other monuments and sites in Iran, on a number of ways. It is the heart of the city, to which every important street converges, where everyone meets, and everything significant happens. The square also comprises a mosque, a bathhouse, the Water Museum, a caravanserai, and several shops. Not far, a few bazaars offer goods and products to indulge the whole of humankind.
Amir Chakhmagh with its 48 meters high minarets has a very good view especially at nights and is a must see attraction.