For 4,000 years, termites have been building these massive mounds in Brazil

 Noel Kirkpatrick

 Researchers have found about 200 million cone-shaped mounds hiding in plain sight in northeastern Brazil. They stand roughly 8 feet tall and 29.5 feet across. They cover 88,800 square miles (23,000 square kilometers) of dry tropical forest — roughly the size of Great Britain or Oregon.

These mounds aren’t architectural relics of an ancient civilization. No, these long-standing marvels were built by, and are still being used by, termites…