Is this one of the 77 Wonders of the World ? Yes, no, vote.
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“On the eastern slopes of the Masai escarpment bordering the Great Rift Valley are natural rock shelters, whose vertical planes have been used for rock paintings for at least two millennia. The spectacular collection of images from over 150 shelters displays sequences that provide a unique testimony to the changing socio-economic base of the area from hunter-gatherer to agro-pastoralist, and the beliefs and ideas associated with the different societies.” More information via the World Heritage Centre.