Concerned with the ‘meaning’, variability and material transformation of the sacred oboo cairns of Inner Asia, this study focuses upon four of these stone settings within the environs of Mergen Monastery. Two have been rebuilt since their destruction during the Cultural Revolution, and one markedly registers its recent history. The layout of these complex monuments (involving diverse ancillary elements) reflects the processes of Buddhicization of the landscape. Comparison between their form and Buddhist texts outlining oboo construction allows appraisal of their prescription and actuality. These monuments raise issues relevant beyond their immediate cultural and geographical context, as they express an interplay between history and ‘timelessness’; the latter effectively amounting to a ‘reincarnation’ of material culture (i.e. denial of change). Finally, the deployment of oboos relates to broader concepts of landscape orientation; their relationship with Mongolian directional systems is explored.