Within the southern part of Bishapur, remains of a huge building dating from the Islamic era are seen. According to historical sources, they belong to the Bishapur mosque which based on its unearthed parts was built following the model of early Islamic mosques like the mosques of Istakhr, Siraf and Susa. The mosque had a central courtyard surrounded by multi-columned porticoes. Its round columns were made of stones and had cubic pedestals. Seemingly some Sassanian structures provided the building materials for the construction of the mosque.