Sultan Uljaitu added to the structure by building a mosque and a minaret. The tomb is located within a rectangular mosque with an inner court and minaret. The mosque is two storied and with an adjacent minaret. Near the mosque is a minaret, 40 m high. This is the tallest minaret in the southern Arabian peninsula. The main minaret is its tallest feature. In 1659, the northern minaret attached to the mausoleum collapsed. It is a domed structure with a pencil minaret. Its minaret is the world's second tallest minaret at . At the heart of the city is the ancient Citadel of Erbil and Mudhafaria Minaret. There still remain a minaret and some marble arches and columns. It has a courtyard with a tall square minaret. Above this is the third balcony, crowned by the finial top of the minaret. The minaret and Turkish entranceway were removed. The Minaret of Jam in the Hari River valley is a UNESCO World Heritage site.