This enormous underground city

This enormous underground city

This enormous underground city that once housed 20,000 people was accidentally discovered by a man after knocking down a wall in his basement. When archaeologists later arrived to the site, they revealed that the city was 18 stories deep and had everything needed for underground life, including schools, chapels, and even stables.

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Archaeological sites in North America—the Cliff Palace at Mesa Verde.

Archaeological sites in North America—the Cliff Palace at Mesa Verde.

Located high within the cliffs of southwestern Colorado lies one of the most extraordinary archaeological sites in North America—the Cliff...Read more

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