England, Nottinghamshire, Ratcliffe, Ratcliffe Power Station with cloud of smoke being released from the chimneys silhouetted at dawn.

England, Nottinghamshire, Ratcliffe, Ratcliffe Power Station chimneys with rising smoke silhouetted at dawn.

Iceland, Snaefellsnes Peninsula National Park, Djupalonssandur black sand beach. Two people in silhouette sitting on the beach looking out to see.

Iceland, Snaefellsnes Peninsula National Park, Djupalonssandur black sand beach. Two people in silhouette sitting on the beach looking out to see.

Iceland, Snaefellsnes Peninsula National Park, Djupalonssandur black sand beach. Sightseeing tourists silhouetted on the skyline.

India, Narmada River, Dusk puja or prayers in Holy river. Two figures standing in river at waist height with raised arms silhouetted against sunset sky reflected in water.

Afghanistan, General, Nomadic Kuchi camel train silhouetted against pale sky. The Kuchis are nomadic herders and usually Pashtun.

England, London, One capsule on the London Eye silhouetted against the sun.

England, London, The London Eye capsules silhouetted against the sun.

Qatar, General, Oil refinery at sunset.

France, Brittany, La Roche Bernard, Silhouetted couple walking down hilly street.

India, Maharashtra, Aurangabad, Bibi-ka-Maqbara the poor man s Taj Mahal. Built 1679 as a mausoleum for Aurangzeb s wife Rabia-ud-Daurani, Exterior and silhouetted visitors framed in arch.

Portugal, Porto, Vila Nova de Gaia, View over the River Douro towards the Ribeira area of Porto with Ponte da Arrabida which links Porto to Vila Nova de Gaia and was opeded in 1963.

Portugal, Porto, Vila Nova de Gaia, View over the River Douro towards the Ribeira area of Porto with Ponte da Arrabida which links Porto to Vila Nova de Gaia and was opeded in 1963.

Portugal, Porto, Vila Nova de Gaia, View over the River Douro towards the Ribeira area of Porto.

Portugal, Porto, Vila Nova de Gaia, View over the River Douro towards the Ribeira area of Porto.

Portugal, Porto, Vila Nova de Gaia, View over the rooftops and the River Douro towards the Ribeira area of Porto.

Portugal, Porto, Vila Nova de Gaia, Decorated tourist boats moored at a jetty with Sandeman sign, and the Ribeira area of Porto in the background.

Portugal, Porto, Vila Nova de Gaia, Decorated tourist boat with passengers in transit and Rabelo cargo boats plus the Ribeira area of Porto in the background.

Portugal, Porto, Vila Nova de Gaia, Rabelo cargo boats on the River Douro with the Ribeira area of Porto in the background, Rabelo cargo boats were used for bringing wine from the vineyards in the Dou...

Portugal, Porto, Vila Nova de Gaia, Rabelo cargo boat on the River Douro with the Ribeira area of Porto in the background, Rabelo cargo boats were used for bringing wine from the vineyards in the Dour...

Portugal, Porto, Vila Nova de Gaia, Rabelo cargo boats on the River Douro with the Ribeira area of Porto in the background, Rabelo cargo boats were used for bringing wine from the vineyards in the Dou...

Portugal, Porto, Vila Nova de Gaia, Rabelo cargo boats on the River Douro with the Ribeira area of Porto in the background, Rabelo cargo boats were used for bringing wine from the vineyards in the Dou...

Portugal, Porto, Vila Nova de Gaia, Rabelo cargo boats on the River Douro with the Ribeira area of Porto in the background, Rabelo cargo boats were used for bringing wine from the vineyards in the Dou...