underground ruins

this is similar to a lot of other ruin ideas but different I would like to see ruins found in the underground, for example imagine walking around the new caves then stumbling across a ancient ruin that you could find new recipes in for example you normally find redstone ore when going for redstone but you stumble across some ancient redstone town full of machines and traps with blueprints here and there allowing you to get advanced redstone in one for example you could find a recipe for a teleporter or a way to put redstone that takes up space in one block or a advanced piston, or some ancient library full of enchanted books and enchantments maybe even a way to bring in the enchanter from minecraft dungeons and the treasure could be any where from common bad enchantments to a few rare enchantments depending on the biome above it say roofed forest you could find curses this could be a way to add more curses to the game or some ancient explorer ruins, ruins that would have advanced maps which upon finding could allow you to make underground maps.