This monument is the heart or soul, of Muang Sing sanctuary. The 4 gates locate in the fortification wall ail face the central building. Originally this moment build of literate blocks was covered with mortar with stucco relieves. When you walk trough the main entrance in the East you will see a cross-shaped pavilion.

This space was probably used for relaxation purpose and preparing the offerings. Go ahead and you will see a small pool in which people washed their feet before entering the holy place.

In the next terrace you can see 4 basins in which people put incense sticks as the smoke can purify body and mind. You then walk to the stairs leading to the gateway. The central space inside was use for ceremonies. On the left-hand side, stand the library where writings and religious objects were kept.

The heart of the Prang in which stands the statue of god Boddhisatawa Avalokitesavara is considered as the god’s residence.