Chetuphon Vimolmangklararm during the reign of King Rama IV. Apart from the construction of a fourth great chedi and minor modifications by Rama IV, there had been no significant changes to Wat Pho since. Repair work, however, is a continuing process, often funded by devotees of the temple. The temple was restored again in 1982 before the Bangkok Bicentennial Celebration. The temple complex Wat Pho is one of the largest and oldest wats in Bangkok covering an area of 50 rai or 80,000 square metres. It is home to more than one thousand Buddha images, as well as one of the largest single Buddha images at in length. The Wat Pho complex consists of two walled compounds bisected by Chetuphon Road running in the east–west direction. The larger northern walled compound, the phutthawat, is open to visitors and contains the finest buildings dedicated to the Buddha, including the bot with its four directional viharn, and the temple housing the reclining Buddha. The southern compound, the sankhawat, contains the residential quarters of the monks and a school. The perimeter wall of the main temple complex has sixteen gates, two of which serve as entrances for the public (one on Chetuphon Road, the other near the northwest corner). The temple grounds contain four great chedis, 91 small chedis, two belfries, a bot (central shrine), a number of viharas (halls) and various buildings such as pavilions, as well as gardens and a small temple museum. Architecturally the chedis and buildings in the complex are different in style and sizes. A number of large Chinese statues, some of which depict Europeans, are also found in the complex guarding the gates of the perimeter walls as well as other gates in the compound. These stone statues were originally imported as ballast on ships trading with China. Wat Pho was also intended to serve as a place of education for the general public. To this end a pictorial encyclopedia was engraved on granite slabs covering eight subject areas: history, medicine, health, custom, literature, proverbs, lexicography, and the Buddhist religion. These plaques, inscribed with texts and illustrations on medicine, Thai traditional massage, and other subjects, are placed around the temple, for example, within the Sala Rai or satellite open pavilions. Dotted around the complex are 24 small rock gardens (khao mor) illustrating rock formations of Thailand, and one, called the Contorting Hermit Hill, contains some statues showing