These ancient cities were built underground — and no one knows exactly why

These ancient cities were built underground — and no one knows exactly why

Long before steel and concrete-shaped skylines, entire cities were carved deep below the Earth. These were not just emergency shelters — these were fully developed with food storage, schools, temples, and homes. Mind-boggling ancient cities. One could hold over 20,000 people. But despite decades of research, no one knows exactly why they were built. Were […] The post These ancient cities were built underground — and no one knows exactly why appe…