1178-32467 - Mixed Race female runner stretching

1178-32471 - Mixed Race female runner stretching

1116-47976 - A woman walks alone among the tall, leafless tree trunks in a forest, Arizona, United States of America

1116-44843 - A King Penguin Looks Down And Wonders Whether To Step Over A Pebble On A Sandy Beach Or Stand On It, With Another Penguin Just Behind It, And They Both Have Black And Orange Heads, White Breasts With Orange Patches At The Throat, Grey Backs And Flippers A

1174-6199 - Space Needle and high rise buildings in Seattle city skyline, Washington, United States

1116-40341 - Ladder Over Stone Wall, Lake District, Cumbria, England, United Kingdom

1116-40340 - Ladder Over Stone Wall, Lake District, Cumbria, England, United Kingdom

746-39002 - Riding Show "Piazza del Plebiscito", Naples, Campania, Italy

746-39011 - Riding Show "Piazza del Plebiscito", Naples, Campania, Italy

746-39004 - Riding Show "Piazza del Plebiscito", Naples, Campania, Italy

746-39003 - Riding Show "Piazza del Plebiscito", Naples, Campania, Italy

746-39001 - Riding Show "Piazza del Plebiscito", Naples, Campania, Italy

1178-7054 - Close-up of broken ice, Germany

1178-7053 - Close-up of broken ice, Germany

1178-6258 - Road block

1178-2779 - Detail of golf course sand trap

1178-6256 - Side view mirror

1178-6257 - Road block

832-377190 - Athlete, 20 years, jumping hurdles, Winterbach, Baden-Württemberg, Germany

832-377191 - Athlete, 19 years, jumping hurdles, Winterbach, Baden-Württemberg, Germany

832-347592 - Fence with barbed wire

832-280187 - The Tarot Garden of Niki de Saint-Phalle Capalbio Provincia de Grossetto Tuscany Italy

832-363320 - Yellow traffic light in blue sky

832-363319 - Red and yellow traffic light in blue sky

832-363318 - Red traffic light in blue sky

832-199346 - Storm surge barrier, Delta Works, Zeeland, Holland, Netherlands, Europe

832-199345 - Storm surge barrier, Delta Works, Zeeland, Holland, Netherlands, Europe

832-135149 - Krafla geothermal power station near Lake Myvatn, Reykjahlid, Iceland, Europe

832-77366 - SUV climbing rock, Akakus, Acacus Mountains or Tadrart Acacus, Sahara desert, Fezzan, Libya, North Africa

832-83911 - Coastal protection, concrete bank protection of the dike, North Coast, North Friesland, Schleswig-Holstein, Germany, Europe

832-81107 - Geothermal power plant, Wairakei Borefield, pipelines crossing a road, North Island, New Zealand

857-71786 - Swarm robots designed by Marco Dorigo, center, and his graduate students Universit_ Libre de Bruxelles, Brussels, Belgium. An individual robot could not cross this obstacle in the forest, but when they link together and communicate with each other(when they do this lights go on) they can cross a barrier. This was inspired by how ants link together in a group to cross barriers.

857-55086 - A person jumping over obstacle during a cyclocross race

857-48190 - A crew of workers clears the tracks of the train that connects the Peruvian cities of Huancayo and Huancavelica. During the rainy season, January to March, the route is heavily affected by landslides.

857-31774 - DEATH VALLEY, CA, JANUARY 07: A mountain biker staring at a "sliding rock" on The Racetrack, a dried lake bed in Death Valley National Park, California on January 07, 2006.

857-36088 - Jeff Crystol foreground and Josh Williams in backround descending Miners Hollow or Knotted Rope Canyon, San Rafael Swell, Utah.

857-11496 - Young snowshoer in an obstacle course in Stowe, Vermont.

832-27721 - Gnu, Blue Wildebeest (Connochaetes taurinus), gnu migration, gnu jumping into the Mara River, Masai Mara, Kenya

832-27716 - Gnu, Blue Wildebeest (Connochaetes taurinus), gnu migration, gnus crossing the Mara River, Masai Mara, Kenya

733-87 - Kayaking on the Zambezi River, Batoka Gorge, Victoria Falls, border of Zambia/Zimbabwe

526-1394 - Rush hour traffic jams in London, England, UK

526-2983 - Traffic jam on the M25 Motorway near London, England, UK