Jam'e Mosque Masjid-e Jam'e, also known as the Friday Mosque, like so many important was the focus of a complex of buildings of various periods and styles in various states of conservation. The site of a Sassanian fire temple, its major features, however, were begun in 1324 and continuously developed for forty years. There is no more impressive gateway in Iran than this great soaring 14-century edifice. Crowned by a pair of minarets, the highest in Iran, the portal's facade is decorated from top to bottom in dazzling tile work, predominantly blue in color. Inside there is along arcaded court where, behind a deep-set southeast ivan, is a sanctuary chamber which, under a squat tiled dome, is exquisitely decorated with faience mosaic: its tall faience mihrab, dated \365, is one of the finest of its kind in existence. The tile work has recently been skillfully restored and a modem library built to house the mosque's valuable collection of books and manuscripts. By the side of the Masjid-e Jam'e, along a side street to the right, was the Vaqt va Sa'at (Time and Hour) complex, now reduced to the Shrine ofRokn od-Din, who was responsible for building the complex. ! The observatory (which gave its name), a i l, and a madraseh, have all vanished.