The Ubosot of Wat Chom Khiri Nak Phrot, popularly known as "The Heaven-Built Ubosot," is an ancient architectural masterpiece from the late Ayutthaya period located on the hill. Legend has it that the structure was miraculously completed in a single night by celestial beings. It is uniquely designed as a "Maha Ut" style hall without windows. The interior houses a magnificent principal Buddha image, surrounded by exquisite artistic details: carved wooden Brackets (Khanthuay) supporting the eaves, double stone Boundary Markers (Bai Sema) signifying its sacred limits, and intricate Stucco Work on the pediment and portals. These elements reflect the deep-rooted faith in divine protection and the mythical Naga guardians of the mountain.