England, County Durham, Cow Green Reservoir. Aerial photo of Cow Green Reservoir, built to supply water to the industries of Teesside.

Germany, Berlin, Reichstag. Glass dome above debating chamber at the Reichstag, designed by Architect Norman Foster.

Germany, Berlin, Reichstag. Glass dome above debating chamber at the Reichstag, designed by Architect Norman Foster.

Germany, Berlin, Reichstag. Glass dome above debating chamber at the Reichstag, designed by Architect Norman Foster.

Germany, Berlin, Reichstag. Glass dome above debating chamber at the Reichstag, designed by Architect Norman Foster.

Germany, Berlin, Berlin TV Tower. The Berlin TV Tower and surrounding Alexanderplatz photographed at dusk.

Germany, Berlin, Berlin TV Tower. The Berlin TV Tower and surrounding Alexanderplatz photographed at dusk.

Germany, Berlin, Berlin TV Tower. The Berlin TV Tower and surrounding Alexanderplatz photographed at dusk.

Germany, Berlin, Humboldt Forum. TV Tower & Humboldt Forum, a museum dedicated to human history, art and culture, located in the Berlin Palace on the Museum Island.

Germany, Berlin, Humboldt Forum. Humboldt Forum, a museum dedicated to human history, art and culture, located in the Berlin Palace on the Museum Island.

Germany, Berlin, Kronprinzenbrücke. Crown Prince Bridge looking towards the Federal Press Conference building (Bundespressekonferenz).

Germany, Berlin, Kronprinzenbrücke. Crown Prince Bridge looking towards the Federal Press Conference building (Bundespressekonferenz).

Germany, Berlin, Marie-Elisabeth-Luders-Haus. Marie-Elisabeth-Luders-Haus, a modern Government building, on the River Spree.

Germany, Berlin, Marie-Elisabeth-Luders-Haus. Sunset viewed from Marie-Elisabeth-Luders-Haus, a modern Government building, on the River Spree.

Germany, Berlin, Memorial to the Murdered Jews of Europe. The Memorial to the Murdered Jews of Europe also known as the Holocaust Memorial.

Germany, Berlin, Memorial to the Murdered Jews of Europe. The Memorial to the Murdered Jews of Europe also known as the Holocaust Memorial.

Germany, Berlin, Memorial to the Murdered Jews of Europe. The Memorial to the Murdered Jews of Europe also known as the Holocaust Memorial.

Germany, Berlin, Memorial to the Murdered Jews of Europe. The Memorial to the Murdered Jews of Europe also known as the Holocaust Memorial.

Germany, Berlin, Memorial to the Murdered Jews of Europe. The Memorial to the Murdered Jews of Europe also known as the Holocaust Memorial.

Germany, Berlin, Potsdamer Platz. Skyscrapers at Potsdamer Platz in the city of Berlin.

Germany, Berlin, Potsdamer Platz. Skyscrapers at Potsdamer Platz in the city of Berlin.

Germany, Berlin, Potsdamer Platz. Skyscrapers at Potsdamer Platz in the city of Berlin.

Germany, Berlin, Potsdamer Platz. Skyscrapers at Potsdamer Platz in the city of Berlin.

Germany, Berlin, Potsdamer Platz. Skyscrapers at Potsdamer Platz in the city of Berlin.

Germany, Berlin, Humboldt Forum. Humboldt Forum, a museum dedicated to human history, art and culture, located in the Berlin Palace on the Museum Island.

Germany, Berlin, Paul Loebe Haus. The Paul Löbe House is a modern glass building in Berlin's government district.

Germany, Berlin, Oberbaum Bridge. Train passing over the Oberbaum Bridge (Oberbaumbrucke) in the city of Berlin.

Germany, Berlin, Oberbaum Bridge. Train passing over the Oberbaum Bridge (Oberbaumbrucke) in the city of Berlin.

Germany, Berlin, Oberbaum Bridge. Train passing over the Oberbaum Bridge (Oberbaumbrucke) in the city of Berlin.

Germany, Berlin, Berlin East Side Gallery. Street art and murals on the Berlin Wall at the area now known as the Berlin East Side Gallery.

Germany, Berlin, Berlin East Side Gallery. Street art and murals on the Berlin Wall at the area now known as the Berlin East Side Gallery.

Airplane Wing viewed from airplane window just after sunset on a flight from the UK to Germany.

Airplane Wing viewed from airplane window just after sunset on a flight from the UK to Germany.

England, Northumberland National Park, Hadrian's Wall. A small stretch of Hadrian's Wall near Black Carts Turret.

England, Northumberland National Park, Hadrian's Wall. A small stretch of Hadrian's Wall near Black Carts Turret.

England, Northumberland National Park, Hadrian's Wall. A small stretch of Hadrian's Wall near Black Carts Turret.

England, Northumberland National Park, Hadrian's Wall. A small stretch of Hadrian's Wall near Black Carts Turret.

England, Northumberland, Hadrian's Wall. A mid-winters day at Cawfields Quarry along Hadrians Wall, a world heritage site located within the Northumberland National Park.

England, Northumberland, Hadrian's Wall. A mid-winters day at Cawfields Quarry along Hadrians Wall, a world heritage site located within the Northumberland National Park.

England, Northumberland, Northumberland National Park. A well preserved stretch of Hadrian's Wall passing along Caw Gap.

England, Northumberland National Park, Hadrian's Wall. View north of the wall from Caw Gap.

England, Northumberland, Northumberland National Park. A well preserved stretch of Hadrian's Wall passing along Caw Gap.

England, Northumberland National Park, Hadrian's Wall. Hadrian's Wall snaking over the crags of Steel Rigg with Crag Lough in the distance.

England, Northumberland, Hadrian's Wall. A dramatic stretch of Hadrians Wall running along the Walltown Craggs.

England, Northumberland, Sycamore Gap, Northumberland National Park. Sycamore Gap, a famous landmark along Hadrians Wall in the Hadrians Wall World Heritage Site.

England, Northumberland, Sycamore Gap, Northumberland National Park. Sycamore Gap, a famous landmark along Hadrians Wall in the Hadrians Wall World Heritage Site.

England, Northumberland, Sycamore Gap, Northumberland National Park. Sycamore Gap was a famous landmark along Hadrians Wall in the Hadrians Wall World Heritage Site.

England, Northumberland, Sycamore Gap, Northumberland National Park. Sycamore Gap was a famous landmark along Hadrians Wall in the Hadrians Wall World Heritage Site.

England, Northumberland, Hadrian's Wall. View along Hadrian's Wall from Hotbank Crags, a UNESCO World Heritage Site.

England, Northumberland, Hadrians Wall. Milecastle 39 on Hadrians Wall, a world heritage site located within the Northumberland National Park.