In This Minecraft Seed : 6571111752555831323

And On This Coordinates : -1063 -20 764

You can see that the ancient city can generate in lava, and that ruins the whole concept, we can't even access the chests !

So, if you want to see this, create a new world with the seed above, tp to the coordinates i write, and normally, you see a piece of the giant frame above the lava, but nothing else!