An ancient temple with a long history that has been an integral part of Phetchabun for many years, it was established in the year 1815 during the late Ayutthaya period. Originally, this temple was named Wat Sai Ngam, reflecting the beautiful, clean red sandy area that serves as the temple grounds. Inside the temple, you will find the principal Buddha statue known as "Phra Phuttha Mongkol," a plaster sculpture in the style of Lan Chang. Originally crafted in bronze, it was paired with two standing Buddha statues but was stolen by Japanese soldiers during World War II. One of the notable historical sites here is the old ordination hall (sim), a vital Buddhist architectural relic that has been used for religious ceremonies for almost 200 years. The sim, built in the Lan Chang style, features unique characteristics reflective of the descendants of Luang Prabang residing in the area at that time. Additionally, it is distinguished by its stunning wall paintings, which were created using a mixture of powdered colors and animal glue on a plaster surface. These illustrations depict the Ten Lives of the Buddha, narrating the various incarnations of the Buddha before he attained enlightenment, along with scenes of hell and heaven that impart philosophical teachings on refraining from evil and doing good. The artwork vividly reflects the life and customs of the local community from the past. Location: Lom Kao District, Phetchabun Province. How to get there: Take Highway Lom Kao-Wang Ban, approximately 3 kilometers from Lom Kao District, then about 1 kilometer from the turn-off leading to Village Na Sai, Group 2.