By Raul Cortes | Monterrey, Mexico.

By Raul Cortes | Monterrey, Mexico.

By Kristen Farrar | Mesa, AZ, USA

By Hassan Dadashi.arani | Esfahan.iran

By GREG REDFERN | Fort Monroe, Virginia

By Helio Vital | Saquarema, Rio de Janeiro, Brazil

By Dr Ski | 9.3°N, 123.3°E

By Dr Ski | 9.3°N, 123.3°E

By Helio Vital | Saquarema, Rio de Janeiro, Brazil

By Annette Seidenglanz | Madonna Peak, The Long Trail, Stowe, VT

By Kathy Ax | Palmer, Alaska USA

By kevan hubbard | North Hinksey, Oxfordshire, England

By Roy Bradfield | City of Sunderland, England, UK.

By Radu Anghel | Bacau, Romania

By Jon Greif | Emery Cove, Emeryville, CA, USA

By Jim Stelten | Harrisonburg, VA