Historic traditional water wheel irrigation system, Betancuria, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Natural arch, Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Leitenwaal path, Schluderns, Vinschgau, Val Venosta, South Tyrol, Italy, Europe

Rolled snow trail on the 1493m high Mt. Feldberg in the Black Forest, on the horizon the new Feldbergturm antenna with the weather radar system, Landkreis Breisgau-Hochschwarzwald district, Baden-Wuerttemberg, Germany, Europe

Metro system Train and Traffic in northern Virginia

Female hiker waits for pack horses to pass on the South Kaibab Trail in Grand Canyon National Park north of Williams, Arizona May 2011. The South Kaibab Trail starts on the south rim of the Colorado Plateau and follows a ridge out to Skeleton Point allowing for 360-degree views of the canyon then down to the Colorado River. At the Colorado River the trail connects with the North Kaibab trail as part of the Arizona Trail system, that crosses the state of Arizona from Mexico to Utah.

A woman mountain biking on the Horse Gulch Trail System, Durango, Colorado

A father, Brad Piehl, watches while his daughter, Jenna, snowshoes for the first time, on the snow covered Boreas Pass Road, a popular winter recreation trail for cross country skiers and snowshoers. The road becomes a trail, and is part of the Rails to Trails system. It follows an old railroad grade southeast over the mountains to the town of Como.

Rolando Garibotti skis with a pack on the Boreas Pass trail which crosses the Rocky Mountains from Breckenridge to Como, Colorado. The trail is part of the Rails to Trails system and follows an old railroad grade. The trail is also part of the 10th Mountain Division Hut System, with a hut called the Section House located along the trail at the top of Boreas Pass. The trail is within Pike-San Isabel National Forest

Tent And Milky Way Visible In The Sky Over Teton Range, Grand Teton National Park, Wyoming, United States Of America

Male Hiker Sitting On Bench With Large Wooden Cross Overlooking Valley With Gren Meadows And Trees, Aschau, Austria