Massive underground tunnels discovered across South America are not human-made. Scientists now believe extinct giant ground sloths dug these extensive structures. These palaeoburrows, found in Brazil, ...

Massive tunnels have been discovered in South America, but what animal made them? Learn about the tunnels created by ...

Deep beneath the hillsides and suburbs of Brazil, there are tunnels so vast and regular that they look like abandoned subway ...

This is an extract from Our Human Story, our newsletter about the revolution in archaeology. Sign up to receive it in your inbox every month. A central plot point in the human story is our species’ ...