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Two millennia
The Alcántara Bridge was built in 104-106 CE by Trajan’s legions. It lasted for more than a thousand years without significant maintenance (except for the triumphal arch); it’s only been repaired a few times in its second millennium.

The dam behind it was built in 1969. How long will it last without maintenance? I’m betting the dam is the greatest threat to the existence of the bridge that the latter has ever faced.
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Credit: http://www.panoramio.com/photo/6394246

back to good book of the day:
http://goodbookoftheday.com/?p=814
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