King John's Bridge
The remains of King John's Bridge ( Irish Droichead Eoin ) span the River Griffeen parallel to today's Esker bridge in Lucan in County Dublin in Ireland .
Ireland's oldest bridge is the main archaeological structure within Griffeen Valley Park. The once triple arch bridge was built by King John during his reign between 1199 and 1216. The king is known for building many bridges and is often described as the "bridge minded monarch". The bridge went out of use after about 600 years at the latest in 1816 and although it is in a ruinous condition, an arch still spans the narrow river.
The masonry and construction are described as being of high quality and are believed to have been influenced by the skills of a master craftsman. There were two watermills upstream of King John's Bridge.
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Coordinates: 53 ° 20 ′ 55.6 " N , 6 ° 26 ′ 21.4" W.