I have seen a water-tower with the same shape here in Germany too but I didn't have the impreesion of a nail. But you are right - it looks like a nail or screw someone put into the earth! :)
Thanks for sharing!
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Photo taken in Kasetsart University Kamphaeng Saen Campus, 1 Malaiman Road, Kamphaeng Saen District, Nakhon Pathom 73140, Thailand
Misplaced? Suggest new location