On the 30 June 1894; Tower Bridge was opened to the general public. Development of Tower Bridge began in 1886 and used 432 labourers. Two gigantic wharfs, holding in excess of 70,000 tons of concrete, were sunk into the riverbed to back the bridge. Over 11,000 tons of steel gave the system strength to the towers and walkways. This was then clad in Cornish stone and Portland stone, both to ensure the underlying steelwork and to give the bridge a pleasing and classic appearance.
In fact, many think Tower Bridge is far older than it actually is. That was a design choice, to ensure it matched the surrounding stunning Tower Of London.
But Tower Bridge is just one of many bridges that span across the Thames. The following interesting documentary – The Bridges That Built London with Dan Cruickshank – is an excellent look at both the crossings that still exist, and ones long since gone.