Yazd (یزد jæzd), formerly also known as Yezd, is the capital of Yazd province, Iran. The city is southeast of Isfahan. At the 2016 census, its population was 529,673. Since 2017, the historical city of Yazd is recognized as a World Heritage Site by UNESCO. Because of generations of adaptations to its desert surroundings, Yazd has a unique Persian architecture. It is nicknamed the "City of Windcatchers" (شهر بادگیرها Shahr-e Badgirha) from its many examples. It is also very well known for its Zoroastrian fire temples, ab anbars (cisterns), qanats (underground channels), yakhchals (coolers), Persian handicrafts, handwoven cloth (Persian termeh), silk weaving, Persian cotton candy, and its time-honored confectioneries. Yazd is also known as City of Bicycles, because of its old history of bike riders, and the highest number of bicycles per capita in Iran. It is reported that bicycle culture in Iran originated in Yazd as a result of contact with European visitors and tourists in the last century. Yazd means "pure" and "holy"; Yazd City means "City of the Holy [One, i. e., God]". Former names of this city: Kath, Isatis. Archeological evidence 12 kilometers north of Yazd suggests that the area has been populated since the period of the Achaemenid Empire (550 BC–330 BC). In his Natural History, Pliny the Elder (died 79 AD) mentions a town in the Parthian Empire (247 BC–224 AD) named "Issatis", which is seemingly connected to the name of the Asagarta/Istachae/Sagartians. As a result, some scholars have suggested that the name of Yazd was derived from Issatis (also transliterated as Isatichae, Ysatis, Yasatis), and that the latter name started to be used in the Median or Achaemenid eras. The area encompassing Yazd first started to gain prominence in the Late antiquity, namely under the Sasanian Empire (224–651). Under Yazdegerd I (399-420), a mint was established in Yazd (under the mint abbreviation of "YZ"), which demonstrates its increasing importance. According to the New Persian chronicle Tarikh-i Yazd ("History of Yazd") of 1441, Yazd was re-founded by "Yazdegerd, son of Bahram", i.