By Bob Olsen | New Haven, CT USA

By Jen Scott | Port Canaveral, FL, USA

By Kritsadanshon Sadeewong | Doi Mae-U-Kho, Khun Yuam, Mae Hong Son, Thailand

By Maynor Mijangos | Guatemala

By Lorraine Boyd | Green Island, NY

By SPENCER WESTBROOK | Cajon Pass off I-15, California

By V.LIARD Photography | https://www.flickr.com/gp/vegastarcarpentier/h609RM32YS

By Mohamed Mohamed | Tripoli,Libya

By Kit-fun Ho | Shatin, Hong Kong SAR

By Roberto Ortu | Cabras, Sardinia, Italy

By Lorraine Boyd | Green Island, NY

By Jennifer J. Wilhoit | En route to Sydney, Australia (from Cairns, Australia)

By Dolores Moreno | Highland. CA

By Peter Lowenstein | Mutare, Zimbabwe

By Mohamed Mohamed | Tripoli,Libya

By David Rojas | Pacaya volcano, San Vicente Pacaya, Guatemala