By Grant Petersen | Johannesburg, South Africa

By Dr Ski | Valencia, Philippines

By Matthew Chin | Hong kong

By Dr Ski | Valencia, Philippines

By Dr Ski | Valencia, Philippines

By Claire Shickora | Hueco Tanks National Historical Park, El Paso, Texas, USA

By Claire Shickora | Hueco Tanks National Historical Park, El Paso, Texas, USA

By Darshna Ladva | Pitstone windmill, Buckinghamshire, uk

By Ragini Chaturvedi | Freehold

By Deirdre Horan | Dublin, Ireland.

By Deirdre Horan | Dublin, Ireland.

By Dennis Schoenfelder | Alamosa, Co.

By Dr Ski | Valencia, Philippines

By Dr Ski | Valencia, Philippines

By James Figge | Delmar, NY, US

By Dr Ski | Valencia, Philippines