Vietnam’s government has allowed Hanoi to open the excavation site of its 1,300-year-old citadel to the public in celebration of the capital’s millennial celebration this October.

The Thang Long Imperial Citadel was first discovered in late 2002 during excavation work to build a new national assembly on Hoang Dieu Street.

Authorities have yet to decide on exactly which day they will open the site.

Thang Long Citadel was part of a citadel system built in the 11th century that included the Dai La Citadel, which acted as a defensive rampart with a complete dyke system, and the Forbidden City, where the king and his royal family lived.

Since its excavation, scientists have unearthed vestiges originating from dynasties like Ly, Tran, Le and Nguyen dating back as far as the seventh century.