Metavation on Instagram: "Matthew LaCroix reveals the forgotten world beneath our feet, vast underground cities carved deep into the bedrock of ancient Turkey. Some of these subterranean complexes descend more than 25 levels underground and may have housed tens of thousands of people. Massive stone doors, sealed corridors, and miles-long tunnels connected entire civilizations below the surface, allowing them to survive during times of extreme instability above ground. These underground networks