Little remains of the medieval London bridge, save for a few artifacts and the pedestrian entrance that forms part of St. Magnus the Marytr church in London. Once the key crossing point of the Thames River, the bridge was built in 1209 to replace the original Roman crossing built in 50. It remained in use for over 600 years, before being demolished in the 19th century to provide access for river traffic. The most famous and longstanding of London’s Thames river bridges, the old London Bridge also featured shops, houses, churches, and a gatehouse. It…