Tower Bridge bridge's upper walkways. The pedestrian walkways are above the river at high tide. The main bridge deck carries two lanes of road traffic between two low-level pedestrian walkways across both suspension spans and the opening bascule section of the bridge, with the walkways separated from the roadway by fences. The roadway passes through each of the two towers, whereas the low-level walkways pass around the outside of the towers. One of the chimneys on the bridge, which are often mistaken for lamp posts, connects up to an old fireplace in a guardroom of the Tower of London. It is long-disused.
London Bridge Is Falling Down is an earlier version of the nursery rhyme. Some historians have raised the possibility that the attack never took place. However, the original document detailing the attack was written only about 100 years after what would be a famous event in a highly populated area, leading the majority of historians to conclude that the account is at least relatively accurate. While it might or might not be the origin of the rhyme, this would make King Olaf's victory the only historically recorded incidence of London Bridge "falling down." The theory that the song refers to the burying, perhaps alive, of