 On excavation, Nandangarh turned out to be stupendous Stupa with a polygonal or cruciform base; with its missing dome which must have been proportionately tall, the Stupa must have been one of the highest in India.The walls of the four cardinal directions at the base (only the W ones and partly the S ones were excavated) are each 32 m long and the wall between each has a zigzag course with 14 re-entrant and 13 outer angles.The walls flanking the first and second terraces following the polygonal plan of the base; those pertaining to the upper terraces were circular.