Shiraz, and Yazd are both worth a day or more and the ruins of the ancient city of Persepolis, 70 kilometres from Shiraz is one of world’s most dramatic ruins. Shiraz has wonderful gardens and an interesting mosque tiled with mirrors. Yazd has its winding lanes, wind towers and mud-brick homes. This is the best place to explore the Zoroastrian culture. Check out the impressive three storey high Amir Chakhmaq Complex - with its rows of perfectly proportioned decorated alcoves. If you have the time, the Yazd Water Museum has a most interesting display of the underground water canals called quanats.