By Brian Washburn | Pinnacles National Park, California, USA

By Emily Shearer | Montreal, Quebec, Canada

By Prem Swaroop Kolluru | Visakhaptnam, Andhra Pradesh, India

By Janet Yoder | Carmel, Indiana, USA

By Patrice Duffy | Grundarfjordur Iceland

By Alexander Krivenyshev | Manhattan, New York

By Victoria Bryhan | Corvallis, Oregon

By EGIDIO VERGANI | Milano, Italy

By Patricio Leon | Santiago, Chile

By Mario Rana | Hampton, Virginia

By C. Gentile | Florham Park, NJ USA

By Gustavo Wilches-Chaux | Bogotá, Colombia

By Peter Lowenstein | Mutare, Zimbabwe

By Alexander Krivenyshev | Manhattan, New York

By Douglas Groenhoff | Marana, Arizona, USA

By Paolo Palma | Marcellina, Rome