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Two millennia
The Alcántara Bridge was built in 104-106 CE by Trajanâs legions. It lasted for more than a thousand years without significant maintenance (except for the triumphal arch); itâs 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? Iâm betting the dam is the greatest threat to the existence of the bridge that the latter has ever faced.
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