By ANDY BENTLEY | Mountain View, CA, USA

By Andy Cooper | Wellington, UK

By Andy Dungan | Near Cotopaxi, CO USA

By Andy Dungan | Near Cotopaxi, CO USA

By Mandy Daniels | Stanton Moor, Derbyshire, UK

By Mandy Daniels | Stanton Moor, Derbyshire, UK

By Andy Dungan | Near Cotopaxi, CO USA

By Mandy Daniels | Derbyshire, UK

By Andy Dungan | Near Cotopaxi, CO USA

By Andy Dungan | Near Cotopaxi, CO USA

By Mandy Daniels | Llanrhaeadr-ym-Mochnant, Powys, Wales, UK

By Mandy Daniels | Llangollen, Wales, UK

By Andy Dungan | Near Cotopaxi, CO USA

By Randy Strauss | State park in eastern Nebraska

By Randy Strauss | Papillion, Nebraska USA

By Mandy Daniels | Derbyshire, UK