A photo essay at The New York Times illustrates the crowding occurring at our national parks this summer.
Hikers at Zion National Park, in Utah, have faced wait times of four hours to access certain trails. Visitors to Arches National Park, in the same state, are being turned away at the gate... Yellowstone set visitation records this May, hosting 483,159 visitors.
Above: Mather Point at Grand Canyon National Park. Below: Thunder Hole at Acadia.