The Grand Canyon National Park’s North Rim, often described as the park’s quieter, wilder side, is now closed indefinitely following a fast-moving wildfire that has engulfed more than 8,500 acres and destroyed dozens of structures, including one of the park’s most beloved landmarks, the historic Grand Canyon Lodge.

The visitor center and a wastewater treatment plant were among the 50 to 80 structures lost, the park superintendent said. The area was evacuated Thursday.

Nearly 400 firefighters are working around the clock on the Dragon Bravo Fire burning on the North Rim of Grand Canyon National Park, Tuesday.

Arizona senators are demanding answers from the Department of the Interior about allowing an ongoing wildfire at Grand Canyon National Park to burn for several days before trying to stop it.