After two archaeological excavations of the National Relic of Mount Ban (An Tay Ward, Hue City), experts have discovered a number of vestiges and relics that contribute to confirming that this place is where Nguyen Hue set up Nam Giao Esplanade to sacrifice to “heaven and earth” before ascending the throne. Also, according to the latest archaeological information, experts recommend turning this relic into a special national relic.

After a period of phase 2 excavation of the Mount Ban relic, experts have discovered many more layers of foundation, sandstone, broken bricks... From these discoveries, it can be determined that the altar of heaven in Mount Ban in the Tay Son period had a simple construction technique, taking advantage of the natural rocky terrain.