Park staff close the wildly popular via ferrata (off-harness/nontechincal climbing route) Precipice Trail seasonally to protect the peregrine falcon nesting sites using the same cliffline.
They also work hard to contact visitors here, armed with spotting scopes, to explain why the trail is closed. Visitors behave much more prosaically once they understand what’s at stake.
Site: Precipice Trail Parking Lot, Ocean Drive Loop Road, Mount Desert Island Unit, Acadia National Park, Maine, USNPS 44° 20′ 58.2″ N 68° 11′ 16.44″ W Interactive Google Earth Onsite 3D