Doug takes us to the Sky Islands of Arizona, a unique natural habitat being ripped apart by Donald Trump's border wall. There, 30-foot-tall pylons of steel—enough to build 10 Empire State Buildings—are being driven into the ground as contractors dynamite through mountain ranges and disrupt critical habitat for species like jaguar, javelina and endangered fish and reptiles.Along the way, he helps make a scientific discovery and faces a late night encounter with a vigilante.Follow Along Guest: Doug MainHost: Joe SillsThe Show: Get Lost PodcastRead More: "The U.S. border wall is tearing through wilderness, right under our noses" - National Geographic