Sultan Zain ol' Abedin The Sultan Zain ol-'Abedin tower with its octagonal conical dome, constitutes one of the most important historic buildings of the city of Sari, in respect of its construction, its tile-decorations, and its tomb-box, as well as costly wooden door. Above the entrance door, there is a tile inscription, and another inscription in Riqa' style, runs as follows: The work of Seyed Ali ibn Seyed Kamal od-Din, a mason from Amol. In the tower, there is another wooden box on a tomb, bearing the name of Sultan Amir Shams od-Din. An exquisite inscription has been carved on the wooden box. This inlay box is a masterpiece of handiwork and luckily all of its four sides have remained in good condition. According to the dates given on the inscription, the structure belongs to the 15th century AD.