True! The closest thing we got in the series right now is the Dungeons Tileset. Got any example images you're thinking of? I'd love to add some ancient ruins to the to-do pipeline :)
Viewing post in Fantasy RPG Tileset: Old Town Exteriors comments
Really good question, hmm. I imagine some kind of druidic symbols, maybe etched into the ground. White stone, cracked pillars (similar to the pillars you have in the interior buildings set, but covered in moss and other vegetation). Maybe shaped oddly geometrically, giving it an otherworldly feeling. Some broken walls and scattered stones and bricks. Maybe a golem creature, that serves as a statue as well as, when woken up, an animated character. Hope that works as some ideas for ya :)