Over a period of nine centuries (from the second century BC to the seventh century AD) Buddhist monks and artisans chiseled into the rock, creating 29 caves to serve as their chaityas (prayer halls) and viharas (monasteries). They covered the austere walls of the caves with mural after mural, frieze after frieze, on themes from the life and teachings of Gautama Buddha. And then, suddenly, in what still remains a great mystery they abandoned the caves to the jungle, to the tiger, the deer, and the wild boar. The caves were in a secluded location and were forgotten until, 11 centuries later on April 28, 1819, a British officer hunting wild boar saw the caves and alerted the world to the treasures they contained. It is an amusing thought that if the Wild Life Act had been in force in 1819, the boars would have been safe but the caves might still be waiting to be discovered.