Blue Mosque, as the most glorious edifice left from Kara Koyunlu era, was constructed by the order of Sultan Jahan Shah in 1465. It included a school, a bathhouse and also a bazaar. This fabulous mosque is called the turquoise of Islam due to its beautiful blue tiles. Blue Mosque (or Masjid-e Kabud) is one of the masterpieces of Islamic architecture that is located in Tabriz. The most remarkable features of this mosque are the especial blue tiles which are used in the exterior design, fascinating large dome and double-layered roof made of bricks and limestones. The tile work in harmony of colors along with delicate details and azure lines in the white background have made this mosque as a perfect example of Iranian architecture. Blue Mosque is one of the structures remained from glorious past and survived from one of the history’s catastrophic earthquakes in 1727. The blue mosque has been restored, however, only small parts of the original decoration remained, but the quality of the works, the finesse of the designs and the range of colors used are exceptional. Inside the mosque used to be tiled too, but many of them were destroyed during the earthquake and simply painted, but the tiles are almost complete now. In the past, Blue mosque was a collection of many buildings such as school, mosque, Khaneghah, library and etc. unfortunately nowadays none of them are left and only the mosque is restored. The eye-catching part of the mosque is the roof which gold and lapis lazuli are used to decorate it. Inside the mosque, there is a small cellar, where there are two graves that are likely to belong to Jahan Shah ibn Yusuf, the Kara Koyunlu leader, and his wife although these graves are empty now. Blue Mosque was registered as a national heritage in 1934 and from 1972 to 1975 a great deal of renovation has been done, and recently, renovation and completion of the building, interior, and exterior design have been carried out.