I don't know if this was mentioned already here.
In 1859 the German engineer Werner Siemens visited the Great Pyramid in Egypt and noticed that the tip of the Pyramid was producing a large amount of electricity.
He published an article about it in 1860. It is in German however.
http://books.google.com/books?id=ITE4AAAAMAAJ&pg=PA355
Try this one, in English:
http://books.google.com/books?id=gbtIAAAAMAAJ&pg=PA159&lpg=PA159&dq=werner+siemens+pyramid&source=bl&ots=d5jWatJFpP&sig=nVqauhHCj8cDf3i9cEPHKibfVic&hl=en&ei=TVUiTLGNHcyhnQeTotAm&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBIQ6AEwAA#v=onepage&q&f=false (http://books.google.com/books?id=gbtIAAAAMAAJ&pg=PA159&lpg=PA159&dq=werner+siemens+pyramid&source=bl&ots=d5jWatJFpP&sig=nVqauhHCj8cDf3i9cEPHKibfVic&hl=en&ei=TVUiTLGNHcyhnQeTotAm&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBIQ6AEwAA#v=onepage&q&f=false)