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 Dancing o'er The Lady-Lee. </poem> The oldest extant version could be that recalled by a correspondent to the "Gentleman's Magazine" in 1823, which he claimed to have heard from a woman who was a child in the reign of Charles II (r. 1660–85) and had the lyrics: <poem>London Bridge is broken down, London Bridge is broken down, The earliest printed English version is in the oldest extant collection of nursery rhymes, "Tommy Thumb's Pretty Song Book", printed by John Newbery in London (c. 1744), beginning with the following text: <poem> London Bridge Is Broken down, Dance over my Lady Lee.