The abandoned Pyramids of Sudan - why were they forgotten?

There are more pyramids in Sudan than in Egypt alone. These pyramids have been in existence during the construction of the Giza Pyramids.

This video explores several abandoned monuments along the river Nile in Sudan. They are far more than deserted relics.

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Music video courtesy of GlassDue Live - Sugar Plum Fairy by Tchaikovsky - glass harp