The time has stopped in Unesco-listed Yazd, a remote desert town in Eastern Iran, where most people still worship the Holy Fire of Zoroastrianism in the devoutly Muslim country. Most houses in Yazd are still built of clay and brick, which allows to survive in the hot summers. Clay houses are equipped by "badgir", the medieval air conditioners allowing the ice to be preserved even in the 40-degree heat of August.