When we picture forests, images of the towering Redwoods of California or the lush tropical rainforests of Costa Rica, like those in Monteverde's first ever tree-climbing park, may come to mind.

Petrified Forest National Park is the only national park in the U.S. with a section of old Route 66. The park is also home to a "rainbow" forest, which has colorful tree fossils that are more than 200 ...

In one corner of the Early Life hall of Smithsonian's National Museum of Natural History stand two petrified tree trunks. They are 207 million years old, stony relics of an ancient conifer ...