At the centre of Phra Mahathat Kaen Nakhon is a pyatthat-like (fig.), nine-storey tall stupa, that was inaugurated in 1996 AD, in order to celebrate the Golden Jubilee of King Rama IX's Accession to the Throne, an event symbolized in the dimensions of this edifice.

Whereas the square base of 50x50m symbolizes the 50th Anniversary, the nine-tired roof is representative of Rama IX as the ninth monarch of the Chakri Dynasty, as well as of the chattra, i.e. the nine-tired royal umbrella used by the Thai monarch (fig.).