The Royal Pantheon, called Prasat Phra Thep Bidorn in Thai, is the largest building on the upper platform. It was built on the east end of the platform, next to the Phra Mondop. The Phra Mondop was the first building built of the upper terrace. The Ho Phra Monthien Tham, a sort of library, originally stood on the site, but was burned down by fireworks soon after the temple was built.
- Wat Phra Kaew