On the easternmost of Khao Wang's three peaks, King Mongkut had a small temple built, which he called Wat Phra Kaeo Noi, or “Little Temple of the Emerald Buddha”. In theory, it's a smaller version of the Temple of the Emerald Buddha in Bangkok's Grand Palace, but you would be hard pressed to see the resemblance.
Wat Phra Kaeo Noi, as seen from the Chomphet Pagoda
The structures of the temple are laid out in a north-south line. At the southern and highest end is a pagoda, a little smaller than the Chomphet Pagoda nearby. Next is a small chapel, in front of which is a small pulpit-like structure called a busabok. Further down is an old style pagoda called a prang, painted red. It is surrounded by a few smaller chapels and shelters.