As Europe braces for yet another heatwave, the relentlessly dry conditions that have left the continent gasping for breath have also revealed many of the secrets once long-held by the River Danube.
Running through ten countries across central and southeastern Europe, it has played an important role in trade and conflict on the continent for millennia.
Alexander the Great is said to have pushed tribes his Macedonian kingdom was warring with as far back as the Danube in the sixth century BCE.
Now, amid the drought that has left Europe parched, this complex history is revealing itself.
Among the most surprising things to have
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