The Royal Kurgan is a 4th century BC kurgan (burial barrow) located near present-day Kerch, Crimea. The mound is almost 20 metres high and its base perimeter is about 250 metres. It holds a burial chamber with a square floor plan which gradually merges into the circular shape of a corbelled dome ("false vault"). It is assumed that the Royal Kurgan was the final resting place of a ruler of the Bosporan Kingdom.Photograph: Anatoly Shcherbak