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Under construction.

Under construction.

Bygone Americana — Construction workers building the Golden Gate...

Bygone Americana — Construction workers building the Golden Gate...

Oblique San Francisco bridge tower during construction 1933 quantum spatial historical archive

Oblique San Francisco bridge tower during construction 1933 quantum spatial historical archive

Construction of Golden Gate Bridge digitally coloured

Construction of Golden Gate Bridge digitally coloured

Safety net placed under the Golden Gate Bridge during construction in the 1930s. Its presence saved 19 lives.   These would-be survivors became known as the "Halfway to Hell Club".

Safety net placed under the Golden Gate Bridge during construction in the 1930s. Its presence saved 19 lives. These would-be survivors became known as the "Halfway to Hell Club".

This shot was taken from a helicopter at dawn in May. The new four-lane bridge will mean that commercial vehicles traveling between Phoenix and Las Vegas will no longer take the winding, narrow roadway, built in 1936, that leads across the dam. Photo: Jamey Stillings for The New York Times

This shot was taken from a helicopter at dawn in May. The new four-lane bridge will mean that commercial vehicles traveling between Phoenix and Las Vegas will no longer take the winding, narrow roadway, built in 1936, that leads across the dam. Photo: Jamey Stillings for The New York Times

The making of the Mackinac Bridge, Michigan ...*Can't imagine what my dad must have experienced while working on this.

The making of the Mackinac Bridge, Michigan ...*Can't imagine what my dad must have experienced while working on this.

Tower Bridge construction pictures - found dumped in a skip in 2006 and kept in a brown paper bag under a bed until now. 1892

Stripped down as you've never seen her: Pictures of Tower Bridge during construction found dumped in a skip

Tower Bridge construction pictures - found dumped in a skip in 2006 and kept in a brown paper bag under a bed until now. 1892

The Golden Gate Bridge under construction on November 9, ... Chronicle Archives

The Golden Gate Bridge under construction on November 9, ... Chronicle Archives

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