Photo: Lance King (Getty Images) If you’re visiting Alaska this year, you may get to experience a once-in-a-lifetime geologic event. A glacier in Denali National Park has started moving between 50 to 100 times faster than normal. Advertisement Last month, a pilot flying over Denali—a park home to the tallest mountain in the U.S.—spotted unusual topography around Muldrow Glacier and took photos of the uneven landscape to send to a geologist friend. Using the pilot’s tip, the National Park Service confirmed that the glacier, which sits near Denali (previously known as Mt. McKinley), is experiencing what’s known as a glacial surge event.