By Stephanie Longo | Eleven Mile Canyon State Park, Colorado USA

By kevan hubbard | Avebury, Wiltshire, England

By kevan hubbard | West Kennett, Wiltshire, England

By Kannan A | Woodlands, Singapore

By Kannan A | Woodlands, Singapore

By Kannan A | Woodlands,Singapore

By Kannan A | Woodlands, Singapore

By Dr Ski | 9.3°N, 123.3°E

By Raul Cortes | Monterrey, Mexico

By Dr Ski | 9.3°N, 123.3°E

By Hassan Dadashi.arani | Esfahan.iran

By Dr Ski | 9.3°N, 123.3°E

By Dr Ski | Valencia Observatory Garden

By Dr Ski | Valencia Observatory Garden

By Laura Lea Evans | Reno, NV USA

By Deirdre Horan | Dublin, Ireland.