Caves-both natural and created by excavation-are common on the Tibetan plateau. Although the beginnings of cave use on the plateau are currently unknown, caves became especially important with the advent of Buddhism in the seventh century AD. Today, caves continue to be used in both secular and sacred contexts. In this chapter, although my focus is primarily upon the use of caves within a religious or ritual context, it is necessary to identify and define the material indicators of caves used primarily as dwellings or habitations. Using historical, literary, and anthropological warrants, I then turn to a discussion of why some caves have sacred connotations on the plateau. Finally, I examine two specific manifestations of the sacred: the use of caves as symbolic foundations for temples, shrines, and so-called power places, and the meaning and use of caves within the context of pilgrimage.