Kyrkmolla Kyrkmolla is a mound which used to constitute a fortress. It is located in the north-eastern outskirts of Gurgench. It is particularly significant as the earliest ceramics discovered at the site, dating back to the 5th century BC, were located here. It is protected by a thick mud-brick wall which dates back to the 10th to 14th centuries, and has been partially rebuilt after archaeological excavations. Najm-ad-Din al-Kubra Mausoleum, Sultan Ali Mausoleum and Piryar Vali Mausoleum Complex This complex is situated in the centre of the new town of Kunya-Urgench, within a Muslim cemetery. The Najm-ad-Din al-Kubra Mausoleum was erected in the first half of the 14th century, and derives its name from the philosopher, painter, physician, chess master and general Najm al-Din Kubra, the founder of the Kubrawiya Sufi order. This is one of the structures which was rebuilt during the Khorezm era of prosperity, and also after the Mongol invasion. The Mausoleum of Sultan Ali, who ruled in the 16th century, is located across. It is a hexagonal monument, with a dome measuring 9.5 meters in diameter. The Mausoleum of Piryar Vali, a contemporary of Najm al-Din al-Kubra, is located to the west of the latter's mausoleum, and was built in the 13th and 14th centuries. It is 6.5 meters high and measures 7.5 meters in length. Il Arslan Mausoleum Il Arslan is a magnificent piece of architecture, also known among the people as the Mausoleum of Kho-Rezmshah II Arslan, who ruled from 1156 to 1172. The mausoleum, dating to the 12th century, is the oldest standing monument in Gurgench. The building has a cuboidal structure of baked brick similar to the earliest existing Islamic mausoleum in Central Asia, the early 10th-century mausoleum of the Samanids in Bukhara, but instead of a hemispherical dome it has a faceted conical roof. The structure is decorated with a motif carved in relief into brick panels, a frieze containing an aphorism written in beautiful script, and with carved vegetal motifs displaying variations of an arabesque pattern. The decorative scheme of the dome presents a tiling technique executed in turquoise glazed brick tiles, forming a geometric pattern. According to some of the latest scientific discoveries, one of the structure's functions, at a certain point, was that of storing water. Ibn Khajib Complex This monument is dedicated to Ibn Khajib, one of Najm-ad-Din al-Kubra's talented disciples. It is located in the western