The remarkable 5th century BC bas-reliefs on the Apadana Staircase at Persepolis, Iran, have survived untouched because the ancient city was buried under sand and forgotten until the 1930s.
The remarkable 5th century BC bas-reliefs on the Apadana Staircase at Persepolis, Iran, have survived untouched because the ancient city was buried under sand and forgotten until the 1930s. © David Stanley from Nanaimo, Canada, CC BY 2.0, via Wikimedia Commons

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