English: The Pyramid Peak Aircraft Warning System lookout in Olympic National Park, Washington, USA. Image part of the National Register of Historic Places nomination, authors National Park Service, Columbia Cascade Support Office.
Français : Surveillance du système d’alerte des aéronefs Pyramid Peak dans le Parc National Olympique, Washington, USA
{{Information |Description ={{en|1=The Pyramid Peak Aircraft Warning System lookout in Olympic National Park, Washington, USA. Image part of the National Register of Historic Places nomination, authors National Park Service, Columbia Cascade Support Of