Terry Whittaker / 2020VISION / Elderly woman feeding Grey herons (Ardea cinerea) with fish from supermarket on frozen River Tame, Reddish Vale Country Park, Stockport, Greater Manchester, UK, December 2010, Model released

Terry Whittaker / 2020VISION / Grey heron (Ardea cinerea) on frozen river, River Tame, Reddish Vale Country Park, Stockport, Greater Manchester, UK, with Northern Rail train on viaduct in the background, December 2010

Peter Cairns / 2020VISION / Silhouette of rusting remains of viaduct, Campfield Marsh RSPB reserve, Solway Firth, Cumbria, UK, April 2011

Paul Hobson / Pyramidal Orchid (Anacamptis pyramidalis), three flowers with railway viaduct in background. Sprotborough Flash, South Yorkshire, England, UK. June.

Loic Poidevin / Millau Viaduct seen through vehicle window, Ayeyron, France, May 2017.

Loic Poidevin / Millau Viaduct, Tarn Valley, Aveyron, France, May.

Loic Poidevin / Millau Viaduct seen through window, Ayeyron, France, May 2017.

Mike Read / Ribblehead Viaduct, Ribble Valley, Ribblehead, Yorkshire Dales National Park, England, UK, July.

Chris Mattison / Walkers and cyclists on the Headstone Viaduct, which crosses Monsal Dale and the River Wye, and is part of the Monsal Trail cycle route. Peak District National Park, Derbyshire, UK July

Chris Mattison / Bicycles parked near the Headstone Viaduct, part of the Monsal Trail cycle route, Peak District National Park, Derbyshire, UK July

Chris Mattison / Bicycles parked near the Headstone Viaduct, part of the Monsal Trail cycle route, Peak District National Park, Derbyshire, UK July

Peter Lewis / Railway Viaduct over the River Nidd, Knaresborough, Yorkshire, England, UK, August 2015.