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Chinese girl under a glazed archway at the Confucius Temple Imperial College, built in 1306 by the grandson of Kublai Khan, administering the official Confucian examination system, Beijing, China, Asia

Confucius Temple and Imperial College built in 1306 by the grandson of Kublai Khan and administered the official Confucian examination system, Beijing, China, Asia

Heliostats reflect sunrays to receiver tower, solar energy scientific research centre, AORA Tulip System, Tabernas, Almeria, Andalusia, Spain, Europe

Array of solar panels on a bright sunny day, Sierra Alhamilla, near Nijar, Almeria, Andalusia, Spain, Europe

Cham people using a Dai fishing system for trei real fish on the Tonle Sap River, Cambodia, Indochina, Southeast Asia, Asia

Cham people using a Dai fishing system for trei real fish on the Tonle Sap River, Cambodia, Indochina, Southeast Asia, Asia

Sheffield trams (Supertram) approaching a stop in Church Street, Cathedral Quarter, Sheffield, Yorkshire, England

Sheffield tram (Supertram) on overhead track approaching Commercial Street from Park Square, Sheaf Valley Quarter, Sheffield, Yorkshire, England

Sheffield Railway station seen from the east with Supertram stop in foreground and city centre behind, Granville Street, Sheffield, Yorkshire, England

Historic traditional water wheel irrigation system, Betancuria, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Heliostats reflecting sun rays, solar energy scientific research centre, AORA Tulip System, Tabernas, Almeria, Andalusia, Spain, Europe

An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America

Historic communal well, El Pozo de los Frailes, Cabo de Gata Natural Park, Nijar, Almeria, Andalusia, Spain, Europe

The queen of roads of the old Roman Road system was the Appian Way linking Rome to the south of Italy, Rome, Lazio, Italy, Europe

Mid-Levels Escalators, the longest outdoor covered escalator system in the world at 800 metres, linking the Mid-Levels with Central, Hong Kong Island, Hong Kong, China, Asia

Tram system in Birmingham which runs from Birmingham to Wolverhampton, Birmingham, England, United Kingdom, Europe

The site of the Commandants House showing supports for suspended floor system with hot air to heat rooms above, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America

Historic traditional water wheel irrigation system, Betancuria, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Skyline and Dubai Metro, Modern Elevated Metro system, opened in 2010, Dubai, United Arab Emirates, Middle East

Metra rail system, station sign in the style of the Paris Metro, Chicago, Illinois, United States of America, North America

Metra rail system, station sign in the style of the Paris Metro, Chicago, Illinois, United States of America, North America

Electric powered modern trolley bus public transport rapid transit system, Centro Historico, Mexico City, Mexico, North America

Foggy Bottom Metro station platform, part of the Washington D.C. metro system, Washington D.C., United States of America, North America

An El train on the Elevated train system, Chicago, Illinois, United States of America, North America

Tram system in Birmingham which runs from Birmingham to Wolverhampton, Birmingham, England, United Kingdom, Europe

Hornsund, a fjord system on the western coast of Spitsbergen, Svalbard Archipelago, Arctic, Norway, Europe

Hornsund, a fjord system on the western coast of Spitsbergen, Svalbard Archipelago, Arctic, Norway, Europe

The Light Rail Transit system with the skyline of the city of Kuala Lumpur behind, Malaysia, Southeast Asia, Asia

POV on the modern driverless Dubai elevated Rail Metro System, running alongside the Sheikh Zayed Road, Dubai, United Arab Emirates, Middle East

Mixed paddy fields growing vegetables under the highly efficient Jhum system of slash and burn and varied crops, Nagaland, India, Asia

The Hong Kong–Zhuhai–Macau Bridge (HZMB), this 55 km bridge–tunnel system is the longest sea crossing and the longest open-sea fixed link in the world. It consist of three cable-stayed bridges, an undersea tunnel, and four artificial islands.

Steam emitted from the New York Steam System, dating back to 1882 providing steam to heat, cool or disinfect around 1,700 buildings, New York, United States of America, North America (Excess steam is vented from orange and white funnels known as stacks.)

Steam emitted from the New York Steam System, dating back to 1882 providing steam to heat, cool or disinfect around 1,700 buildings, New York, United States of America, North America

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

The Coconino Overlook along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Elevated view of traffic and tram on major street during daytime, Hondori, Naka Ward, Hiroshima, Honshu, Japan

Maasai beadwork at the Predator Compensation Fund Pay Day, Mbirikani Group Ranch, Amboseli-Tsavo eco-system, Kenya, East Africa, Africa

Maasai man at the Predator Compensation Fund Pay Day, Mbirikani Group Ranch, Amboseli-Tsavo eco-system, Kenya, East Africa, Africa

Maasai woman at the Predator Compensation Fund Pay Day, Mbirikani Group Ranch, Amboseli-Tsavo eco-system, Kenya, East Africa, Africa

Maasai beadwork at the Predator Compensation Fund Pay Day, Mbirikani Group Ranch, Amboseli-Tsavo eco-system, Kenya, East Africa, Africa

Maasai women at the Predator Compensation Fund Pay Day, Mbirikani Group Ranch, Amboseli-Tsavo eco-system, Kenya, East Africa, Africa

Maasai beadwork at the Predator Compensation Fund Pay Day, Mbirikani Group Ranch, Amboseli-Tsavo eco-system, Kenya, East Africa, Africa

Maasai beadwork at the Predator Compensation Fund Pay Day, Mbirikani Group Ranch, Amboseli-Tsavo eco-system, Kenya, East Africa, Africa

Irrigation canal, Falaj irrigation system (Falaj Al-Khatmeen), UNESCO, palm grove, Birkat Al Mouz, Al Dakhliya region, Jebel Akhdar foothills, Oman

System of protection against invasion of desert sand in palm grove of Zagora, Draa River valley, Province of Zagora, Region Draa-Tafilalet, Morocco

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

Green Naga hills stretching into the distance, scarred by brown scorched hill after slash and burn system has occurred, Nagaland, India, Asia

A subway station showing a train and commuter platform on the Metro de Santiago rapid transit system station, Santiago, Chile, South America

Colourful boats on the Aztec canal system, UNESCO World Heritage Site, Xochimilco, Mexico City, Mexico, North America

Architectural detail of Gran Vía station, part of the Madrid Metro system, situated beneath Gran Vía street in central Madrid, Spain, Europe

A woman wearing a protective hygiene (pollution) face mask on the London Underground subway system, London, England, United Kingdom, Europe

A woman wearing a protective hygiene (pollution) face mask on the London Underground subway system, London, England, United Kingdom, Europe

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

View of Japanese rickshaw (jinrikisha) in busy street scene, Asakusa, Taito City, Tokyo, Honshu, Japan