19th-century London of the Thames from the City of London westwards experienced a flurry of bridge-building during the 19th century, improving overland communication to South London. At the turn of the 19th century there were only three existing bridges in Central London: Westminster Bridge, Blackfriars Bridge, and the ancient London Bridge. Beyond Westminster, the closest bridge was that of Battersea, three miles upstream from Westminster Bridge. All four were demolished and rebuilt over the course of the century (completed in 1862, 1869, 1831,and 1885 respectively). In addition, a slew of new bridges for road, pedestrian, and railway traffic were built: Southwark Bridge
River Thames Charing Cross (Hungerford) Railway Bridge in central London, and the railway bridges by Isambard Kingdom Brunel at Maidenhead Railway Bridge, Gatehampton Railway Bridge and Moulsford Railway Bridge. The world's first underwater tunnel was Marc Brunel's Thames Tunnel built in 1843 and now used to carry the East London Line. The Tower Subway was the first railway under the Thames, which was followed by all the deep-level tube lines. Road tunnels were built in East London at the end of the 19th century, being the Blackwall Tunnel and the Rotherhithe Tunnel. The latest tunnels are the Dartford Crossings. Many foot crossings