Aswan High Dam

Major water reserve and hydroelectric power station built by the Soviet Union during the 1960s. At the time, it was the longest earthen dam.
The first 3 pictures look at the dam from the top, facing down stream. The 4th looks across Lake Nasser, upstream of the dam.
The last picture is of the garden planted along the top of the dam. The waterproof core of the dam was built with local silica. In oder to remain waterproof, the silica must be kept wet. They accomplish this by watering the garden with the excess percolating inside the dam to maintain the core's to integrity.もっと詳しく