Timcheh-e Amin o Dowleh, Kashan Bazaar (19th century).Persian architects used these structures to naturally decrease temperatures, regulate sunlight, and ventilate the interior spaces during the daytime.
In modern Persian, the word for a tile (kashi) comes from the name of the town.
Kashan is cited in the neighbourhood of two of highest peaks of Karkas chain, Mount Gargash to the southwest of Kashan (the home of Iran national observatory, the largest astronomical telescope of Iran) and Mount Ardehaal in the west of Kashan, also known as "Damavand of Kashan" and the highest peak of Ardehaal mountains (end part of Karkas chain in central Iran).
Archeological discoveries in the Sialk Hillocks which lie 4 km west of Kashan reveal that this region was one of the primary centers of civilization in pre-historic ages.
Hence Kashan dates back to the Elamite period of Iran.
The Sialk ziggurat still stands today in the suburbs of Kashan after 7,000 years.
The artifacts uncovered at Sialk reside in the Louvre in Paris and the New York Metropolitan Museum of Art, and Iran's National Museum.By some accounts although not all Kashan was the origin of the three wise men who followed the star that guided them to Bethlehem to witness the nativity of Jesus, as recounted in the Bible.Whatever the historical validity of this story, the attribution of Kashan as their original home testifies to the city's prestige at the time the story was set down.Abu-Lu'lu'ah/Pirouz Nahāvandi, the Persian soldier who was enslaved by the Islamic conquerors and eventually assassinated the caliph Umar al-Khattab in AH 23 (643/4 CE), reportedly fled to Kashan after the assassination and lived there some years before being finally caught and executed.His tomb is one of Kashan's conspicuous landmarks (see gallery below).Sultan Malik Shah I of the Seljuk dynasty ordered the building of a fortress in the middle of Kashan in the 11th century.