Constructed in 1150 AD, this large temple serves as the centerpiece of Nakorn Phanom, coinciding with the city's founding. Originally named "Wat Ming Mueang," it is commonly referred to by locals as Wat That Nakorn. This nickname derives from the presence of a revered relic, a sacred item believed to contain the remains of an Arahant, along with a red sandalwood container and a golden Buddha statue housed within one of the temple's stupas. At that time, local authorities favored the construction of stupas to honor and enshrine the remains of their ancestors, leading to a myriad of stupas within the temple grounds. In 1919, renovations were carried out to remove smaller relics, and the "Phra That Nakorn" was constructed anew, completed in 1922. The structure has a square shape and stands 24 meters tall, representing an important cultural landmark, particularly as the sacred relic for those born on Saturdays. It is widely believed that visitors who come to pay their respects at this stupa will receive blessings that enhance their fortune and status. Additionally, the temple features an ancient ubosot (ordination hall) showcasing beautiful indigenous architectural style.