America's national parks — partially open despite the government shutdown — have become playgrounds for unsupervised visitors who are wreaking havoc on wildlife and fragile ecosystems.

Why it matters: President Trump's decision to keep the parks open against the wishes of conservationists risks causing permanent damage to some of America's most beloved locations.

Zoom in: Rowdy thrill-seekers have been illegally BASE jumping off of Yosemite's grandiose granite peaks, a recipe for disaster in a park that's experienced at least 25 accidental deaths from climbers falling, particularly during bad weather. • The National Park Service told Axios that one of the stone walls at Gettysburg's Devil's Den was toppled in mid-October, desecrating a historic military landmark. • A fire broke out l

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