Phra Mahathat Chedi Phakdi Prakan - Wat Tang Sai or Wat Khao Thong Chai is a pagoda that His Majesty the King bestowed a name It is a Thai architecture in the Rattanakosin period. Created from the faith of the people with the King without using government money to honor and present as a royal merit On the occasion of his 50th anniversary of his accession to the throne, the proportion of the pagoda It is bell shaped and sits on a base. square Has the meaning of the 50-year reign, which is a 5-storey building, representing the 5 Khans and the 9 group chedi representing the temple of King Rama IX.