Causey Arch- built 1725 oldest bridge

The Causey Arch is a bridge near Stanley in County Durham. It is the world's oldest surviving railway bridge.
It was built in 1725-26 by stonemason Ralph Wood, funded by a conglomeration of coal-owners known as the 'Grand Allies' at a cost of £12,000. Two tracks crossed the Arch: one (the main way) to take coal to the River Tyne, and the other (the bye way) for the returning the empty wagons. Over nine hundred horse-drawn wagons crossed the arch each day using the Tanfield Railway. The railway has been restored and has a steam train that runs alongside the arch.
At the time the bridge was completed in 1726, it was the longest single span bridge in the country with an arch span of 31 m, a record it held for thirty years until 1756 when a bridge was built in Pontypridd, Wales. People crossing the bridge had to pay a toll.
The other half and I did a 2 hour walk along the stream side and back then went to Stanley to get a new TV from the Argos clearance shop- bargain!