The oldest mausoleum on the territory of Kunya Urgench is the mausoleum of Khorezm shah Il Arslan. Its most striking feature is the Khorezmian conical dome.
On the main façade is a un-outspoken entrance portal. However, three separated niches above the main entrance are beautifully decorated with terra-cotta stucco decorations, representing floral designs. Il Arslan was the shah of Khorezm from 1156 till 1172.