TONY CRADDOCK / SCIENCE PHOTO LIBRARY TONY CRADDOCK / SCIENCE PHOTO LIBRARY
Hoover Dam. This concrete dam is located on the Colorado River, in Black Canyon, on the border between Nevada and Arizona, USA. It is over 200 metres tall, holding back the waters of the reservoir behind it (Lake Mead). It was built between 1931 and 1936. Numerous pylons and cables distribute the electricity generated by its hydroelectric power station. Photographed in 2011.
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