1. Over the past four centuries the UNESCO list of World Heritage Sites have increased from 12 entries in 1972 when the list was introduced to currently 910 so-called “properties” in 151 countries in 2010.
2. UNESCO, Osun-Osogbo Sacred Grove, 2005 [http://whc.unesco.org/en/list/1118].
3. See Ulli Beier, Mbari Mbayo.Nigeria Magazine, 78(1963): 223–229; Ulli Beier and Frank Speed,New Images in a Changing Society, (Film, Ibadan, 1966); Susanne Wenger,The Timeless Mind of the Sacred. Its Manifestation in the Osun Grove(Ibadan: Institute of African Studies, 1977).