St. James mill and weir on Lot River, town of Cahors, Quercy, Vallee du Lot (Lot Valley), Midi-Pyrenees, France, Europe

Oehlermuehle Mill, Schildwende, Jostal Valley, Titisee-Neustadt, Black Forest, Baden-Wurttemberg, Germany, Europe

The top of Carding Mill Valley in Church Stretton, during unseasonal cold weather in late March, Shropshire, England, United Kingdom, Europe

The Carding Mill Valley in Church Stretton, during unseasonal cold weather in late March, Shropshire, England, United Kingdom, Europe

Distant people running on beach

Footprints on beach

Coyote walking on hill

Caucasian mother carrying daughter while hiking

arbore tribe in Ethiopia

Don Bumham Band, Bale Grist Mill, Saint Helena, Napa Valley, California, USA

Historic stupa at Thame, Bhote Koshi valley, Khumbu Himal, Sagarmatha National Park, Nepal

Mill wheel hut, Wachterbach Mill, historic monument, Maria Luggau, Lesachtal valley, Carinthia, Austria, Europe

Muehlenweg trail, Terenten, Pustertal Valley, Val Pusteria, South Tyrol, Italy, Europe

Brueckenmuehle mill, Gernsbach climatic spa, Murgtal valley, Black Forest, Baden-Wuerttemberg, Germany, Europe

Mill wheel, Wachterbach Mill, historic monument, Maria Luggau, Lesachtal valley, Carinthia, Austria, Europe

Icon, information sign post at Cedars Mill Trail in Lynn Valley Canyon, North Vancouver, British Columbia, Canada

Rooftops of town and landscape of Valle de los Ingenios (Valley of Sugarcane Mills) from the Torre de Iznaga, Trinidad, Sancti Spiritus Province, Cuba

United States, California, Mill Valley, Hiking trail in forest

Wind farm in front of mountains, Palm Springs, California, United States

Wind farm in front of mountains, Palm Springs, California, United States