Truck on road shows great height of a wind turbine in the landscape near Vix in the Loire Valley, France

Karokoram mountains above Skardu Valley viewed from airplane cockpit in Northern Pakistan

Architect Frank Gehry's Guggenheim Museum futuristic architectural design interior at Bilbao, Basque country, Spain

Karokoram mountains with K2 aerial view from an airplane, North Pakistan

Detail of The Petronas Towers in Kuala Lumpur, Malaysia

Architect Frank Gehry's Guggenheim Museum futuristic architectural design interior at Bilbao, Basque country, Spain

Chinese boy walking up steps of the Great Wall of China at Mutianyu, north of Beijing, China

Chinese boy walking the Great Wall of China at Mutianyu, north of Beijing (formerly Peking)

Great Blue Heron in flight, Everglades, Florida, United States of America

Tourists on the rim of King's Canyon, Red Centre, Northern Territory, Australia

The Petronas Twin Towers in Kuala Lumpur, Malaysia

Soldiers carrying rifles on their shoulders marching in an Independence Day parade in Banjul, Gambia. One man stands head and shoulders above the rest. He is likely to be more than seven feet tall.

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

Tourists on the rim of King's Canyon, Red Centre, Northern Territory, Australia

The ancient Great Wall of China at Mutianyu, north of Beijing (formerly Peking)

Great Pyramids, Giza, Egypt.

Nelson's Column, monument to Admiral Lord Nelson in Trafalgar Square, London, United Kingdom

Tourists on viewpoint Echo Point Blue Mountains National Park, Katoomba, Australia.

Detail of The Petronas Towers in Kuala Lumpur, Malaysia

Nelson's Column, monument to Admiral Lord Nelson in Trafalgar Square, London, United Kingdom

Pilots flying 737 jet airplane over Karokoram mountains above Skardu Valley in Northern Pakistan

Spiral minaret of the Great Mosque (Jami al-Kabir), Samarra, Iraq, Middle East

Spiral minaret of the Great Mosque (Jami al-Kabir), Samarra, Iraq, Middle East

Life saving exercise in great height

Mother and daughter female tourists standing in front of the Great Pyramid of Giza, Giza, Egypt

England, Cumbria, English Lake District, Wastwater with Great Gable and Scafell Pike mountains in the background.