Yazd is of foremost importance as a centre of Persian architecture. To deal with the extremely hot summers, it has one of the largest networks of qanats(underground canals) in the world, including magnificent windcatchers (Badgirs). The city is also home to prime examples of yakhchals (Ice houses), the latter of which were used to store ice retrieved from glaciers in the nearby mountains. Yazd is also one of the largest cities built almost entirely out of adobe.The city has a history of over 3,000 years, dating back to the time of the Median empire. . Because of its remote desert location and the difficulty of approach, Yazd had remained largely immune to large battles and the destruction and ravages of war. It was visited by Marco Polo in 1272. Yazd's heritage as a center of Zoroastrianism is also important. Temple, which holds a fire that has been kept alight continuously since 470 AD.
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