Porto Boat Bridge disaster
Portugal · Europe
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On 29 March 1809, the Ponte das Barcas (Portuguese for Bridge of Boats), a pontoon bridge on the River Douro in Porto, Portugal, was the site of one of the world's most deadly bridge disasters which occurred during the First Battle of Porto between Portuguese and French troops. While the exact number of deaths is unknown, estimates of around 4000 deaths are usually given.
Adapted from Wikipedia (CC BY-SA). Photography via Wikimedia Commons.