By Olga Zueva | Pittsburgh, PA

By Ann Smirke | Pebble Beach, CA, USA

By Angela Demetriou McClain‎ | Botetourt County, Virginia

By Page O'Reilly | West Melton, Christchurch, New Zealand

By Mimi Ditchie | See Canyon near Avila Beach, CA.

By Idriss Dhoparee | Chemin Grenier/Mauritius

By Idriss Dhoparee | Chemin Grenier/Mauritius

By Martin Vann | Sedona AZ

By Jack Pope | Kleber Wildlife Management Area, Owen County, Kentucky

By Cheryl Jones | Dale, Texas

By Dan Wyman | Oceanside, California

By Eliot Herman | Tucson, Arizona

By Kym Baldwin Ney | Chalfont pa

By Dr Ski | Valencia Observatory

By Stephanie Longo | Woodland Park Colorado USA

By Raul Cortes | Monterrey, Mexico