San Lak Muang (City Pillar Shrine) at one time was a shrine housing a 1-metre wooden column topped with a carving in the form of a lotus bud. It is situated near the Old City Wall, which at present is the residence of the Provincial Land Assistant, as well as the Municipal Sanitary Service Centre. In 1910, the neglected city pillar was enshrined at the Red Building in the women's school of Sri Nakhon Nayok. Later the shrine was rebuilt into an elegant four-cornered pavilion. Nowadays, City Pillar Shrine is the most revered shrine of the townspeople.

Luang Pho Sian Nakhon the revered Buddha image is enshrined at Bunnak Rakkitaram temple (Wat Tam). It is assumed that this sacred Buddha image dates back to Phra Ruang Era of the Sukhothai period. During an excavation at a whisky brewery, located near Wat Nang Hong, Tambon Tha Chang in the year 1952, the head of a Buddha image was found . The head was kept at a school then known as Nayok Phitthaya School (at present no longer exists), later it was enshrined at Wat Bunnak Rakkitaram. In 1968, the rest of the parts of the Buddha image other than the Buddha’s head were recreated and a new chapel was constructed to house the new complete Buddha image. Since then, the Buddha image came to be known as “Luang Pho Sian Nakhon”.

The Buddha image is enshrined at a peak of a mountain in Kiriwan Temple, which is one of the oldest temples, more than 100 years old. Kiriwan Temple is situated on Nakorn Nayok-Thadan Road, Muang District, Nakorn Nayok. The distance from the town centre to the Temple is approximately 9 kms. The Image of the Emerald Buddha is made of resin, 49 inches in width and 32.9 inches in height, weighing 1 ton and is adorned with 7 karat genuine diamonds, more than 2,000 pieces of emerald, and countless ruby stones.