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Trajan's Bridge
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<p>Trajan's Bridge , also called Bridge of Apollodorus over the Danube, was a <a href="/facts/Roman_segmental_arch_bridge/8osCfVKm">Roman segmental arch bridge</a>, the first bridge to be built over the lower <a href="/facts/Danube/8lMeM9xg">Danube</a> and considered one of the greatest achievements in <a href="/facts/Roman_architecture/1wtv6yFU">Roman architecture</a>. Though it was only functional for 165 years, it is often considered to have been the longest arch bridge in both total span and length for more than 1,000 years. </p><p>The bridge was completed in 105 AD and designed by Emperor <a href="/facts/Trajan/Q6n5uj1q">Trajan</a>'s architect <a href="/facts/Apollodorus_of_Damascus/6MgUzURR">Apollodorus of Damascus</a> before the <a href="/facts/Second_Dacian_War/nkqg4r2T">Second Dacian War</a> to allow <a href="/facts/Roman_army/f6IYbVcR">Roman troops</a> to cross the river. Fragmentary ruins of the bridge's <a href="/facts/Pier/hAWR1lkD">piers</a> are still in existence. </p>