Reliable Game of Thrones fansite Watchers on the Wall brings us this scoop. According to their sources, Dragonpit will feature in season 7 and Daenerys will be present at the location.
The Dragonpit, in the books, is described as a vast, cavernous structure, sitting atop Rhaenys’ hill in King’s Landing. It was used by Targaryens to keep their dragons. During the Dance of the Dragons civil war, about 180 years from now, the pit was destroyed and reduced to flaming ruins. Italica ruins in Spain (above pics) has already been selected as a filming location for season 7 and this news almost confirms that it will be used as Dragonpit in the upcoming season.
Since Dragonpit is in King’s Landing, this also confirms that Daenerys, as expected, will reach King’s Landing in season 7 and she was already very close at the end of season 6.