Those advisor marks could be helpful. Purple for artist advisor and all that. Makes sense. Nice citadel in the screenshot, too.
Also from juegosdb is the following screenshot with an odd building a bit southeast of Istanbul. It looks like a variation on Chichen Itza, but not quite the same compared to the images on Arioch's site. It's lower with fewer stairs and the top looks different, too. I doubt it's part of the mine.
Spoiler :
Look at the construction if Istanbul, the wonder is under construction and not completed yet, that why it looks different.