What’s more, at between 3000 and 1500 years old, these cities are also older than other pre-Columbian ones discovered in the Amazon. Why the people who built them disappeared isn’t clear.

[Related: The ancient Mexican city of Monte Albán thrived with public works, not kings.] However, even among the cities that were likely governed well, some cities were still outliers.

Buried deeper and deeper in the ground, researchers found six ancient cities stacked on top of each other, People’s Online Daily reported. The cities had been covered by mud and sand when the ...

Samothrace, a small, rocky Greek island in the northern Aegean Sea, has a storied past that belies its diminutive size.