The ancient monkey puzzle tree has distinctive spiny leaves and intricate scaly branches. Its unusual features, scientists believe, evolved as a defense against towering, long-necked dinosaurs.

This monkey puzzle tree (Araucaria araucaria) is one of the stranger trees growing in the Smithsonian’s Enid A. Haupt Garden in Washington, D.C. Its triangular leaves, which cover the entire tree, ...

The new docuseries “Patagonia: Life on the Edge of the World” explores one of the wildest places on Earth. The six-part series is available on CNNgo. You can also access CNNgo via our CNN app. The ...