Creeping closer inch by inch, 900 feet above the mighty Colorado River, the two sides of a $160 million bridge at the Hoover Dam slowly take shape. The bridge will carry a new section of US Route 93 past the bottleneck of the old road which can be seen twisting and winding around and across the dam itself.

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The Great Wall started as earth works thrown up for protection by different States. The individual sections weren't connected until the Qin dynasty (221-206 B.C.).

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The construction of the Channel Tunnel and its railway system is one of the greatest technological and engineering feats of the 20th century.  After almost 200 years of debate and planning for a fixed-link between France and Great Britain, the governments of both countries signed a treaty in 1986 to permit the building of a Channel Tunnel.

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The Three Gorges Dam

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The Big Dig

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Taj Mahal

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The Cassini Spacecraft 1

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Roman Coliseum

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Petronas Twin Towers

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Syncrude

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Hoover Dam

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The Great Pyramids of Giza

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Eiffel Tower

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Confederation Bridge

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Laerdal Tunnel

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California High-Speed Railway

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