General Information About Yazd
The name is derived from Yazdegerd I, a Sassanid ruler of Persia. The city was definitely a Zoroastrian center during Sassanid times. After the Arab conquest of Iran, many Zoroastrians migrated to Yazd from neighboring provinces. By paying a levy, Yazd was allowed to remain Zoroastrian even after its conquest, and Islam only gradually became the dominant religion in the city.
Because of its remote desert location and the difficulty of access, Yazd remained largely immune to large battles and the destruction and ravages of war. For instance, it was a haven for those fleeing from destruction in other parts of Persian Empire during the Mongol invasion. In 1272 it was visited by Marco Polo, who remarked on the city's fine silk-weaving industry. In the book The Travels of Marco Polo, he described Yazd in the following way:
It is a good and noble city, and has a great amount of trade. They weave there quantities of a certain silk tissue known as Yasdi, which merchants carry into many quarters to dispose of. When you leave this city to travel further, you ride for seven days over great plains, finding harbour to receive you at three places only. There are many fine woods producing dates upon the way, such as one can easily ride through; and in them there is great sport to be had in hunting and hawking, there being partridges and quails and abundance of other game, so that the merchants who pass that way have plenty of diversion. There are also wild asses, handsome creatures. At the end of those seven marches over the plain, you come to a fine kingdom which is called Kerman.
Yazd briefly served as the capital of the Muzaffarid Dynasty in the fourteenth century, and was unsuccessfully besieged in 1350–1351 by the Injuids under Shaikh Abu Ishaq. The Friday (or Congregation) mosque, arguably the city's greatest architectural landmark, as well as other important buildings, date to this period. During the Qajar dynasty (18th century AD) it was ruled by the Bakhtiari Khans.
Under the rule of the Safavid (16th century), some people migrated from Yazd and settled in an area that is today on the Iran-Afghanistan border. The settlement, which was named Yazdi, was located in what is now Farah City in the province of the same name in Afghanistan. Even today, people from this area speak with an accent very similar to that of the people of Yazd.
Based on Wikipedia, one of the notable things about Yazd is its family-centered culture. According to official statistics from Iran's National Organization for Civil Registration, Yazd is among the three cities with the lowest divorce rates in Iran. The entire city of Yazd is a must-see attraction of Iran and it's one of the world heritage based on UNESCO.