Was Caligula mad—or just misunderstood? Plus, what we know about the ‘happy harmone’

Also, the Buddhist temples that once filled a sacred skyline; the Ice Maiden of Ampato; how much vitamin D do we really need?

This is an email sent by National Geographic. All copyrights and trademarks remain the property of their respective owners. Email Inspire is not affiliated with National Geographic.

National Geographic logo National Geographic