The first pics come from
Split.com and feature Emilia Clarke in costume as Daenerys Targaryen, as well as some extras dressed as slaves. The scenes were being shot at the cellars of Diocletian’s Palace, but it's not clear exactly what was being depicted.
And these ones courtesy of
The Daily Mail are from the Žrnovnica region of Split, and give us a look at the Unsullied preparing for battle.