People have put together many lists of the seven ancient wonders of the world. But this “seven wonders” list celebrates monumental engineering and construction feats of the 20th century. It was chosen by the American Society of Civil Engineers.
Finished in 1931, it towers 1,250 ft over New York City. Until the first tower of the World Trade Center was finished in 1972, it was the world's tallest building.
Itaipu Dam.
Built by Brazil and Paraguay on the Paraná River, the dam is the world's largest hydroelectric power plant. Completed in 1991, it took 16 years to build this series of dams whose length totals 7,744 m. It used 15 times more concrete than the Channel Tunnel.
CN Tower.
In 1976, the tower became the world's tallest freestanding structure. It looms about one-third of a mile high (1,815 ft) above Toronto, Canada. A glass floor on the observation deck lets you look 342 m down to the ground.
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