"Lost Caverns and Buried Cities"

Kapadokya, Turkey is home to hundreds of linked rooms that, together, form an ancient system of underground cities over 2,500 years old. Areas are separated by narrow corridors lit once lit by oil lamps as well as other architectural devices for maximizing the defensibility of the spaces. Settlement initially started on the surface, then slowly moved underground over time. Within the link you will also see other Lost Caverns and Buried Cities, along with videos. Via Web Urbanist