Kalân Mosque, arguably completed in 1514, is equal to the Bibi-Khanym Mosque in Samarkand in size. The mosque is able to accommodate twelve thousand people. Although Kalyan Mosque and Bibi-Khanym Mosque of Samarkand are of the same type of building, they are different in terms of art of building. Two hundred and eighty-eight monumental pylons serve as a support for the multi-domed roofing of the galleries encircling the courtyard of Kalyan Mosque. The longitudinal axis of the courtyard ends up with a portal to the main chamber (maksura) with a cruciform hall, topped with a massive blue cupola on a mosaic drum. The edifice keeps many architectural curiosities, for example, a hole in one of domes. Through this hole one can see foundation of Kalyan Minaret. Then moving back step by step, one can count all belts of brickwork of the minaret to the rotunda.