A massive connected underground dun...

A massive connected underground dungeon complex carved through natural cave stone, built as one continuous linear structure, weathered and ancient in style, dimly lit with scattered torches. Start with an entrance chamber shaped like a ruined old blacksmith forge inside a cave, 30x30 blocks wide and only 20-25 blocks high, cracked mossy stone brick walls, an old anvil, rusted tools, a cold broken furnace, rubble on the floor, stalactites on the low ceiling. From this chamber a narrow 4x4 cave tunnel extends about 20 blocks through rough natural rock, ending at a pair of heavy iron doors set into the stone. Beyond the doors, the tunnel opens into a huge cavern, roughly 100x100 blocks and 100 blocks tall, containing the ruins of a small abandoned village or tiny castle: collapsed stone h