London Bridge is falling down, My fair lady

London Bridge is a twentieth century bridge that spans the River Thames from the Southwark district to the City of London in London, England. Built in 1973, the prestressed-concrete structure replaced a 1831 span designed by Sir John Rennie which was built to replace the 600 year old London Bridge. The elevational stonework from the Rennie bridge is now attached to a bridge in Lake Havasu City, Arizona.

Nancy's Steps is a staircase that leads from Montague Street up to London Bridge, adjacent to the surviving abutments of the Rennie bridge. The name Nancy's Steps is derived from a setting in Charles Dickens' novel Oliver Twist and their appearance in Oliver!, a musical version of the novel by Lionel Bart.

Old London Bridge, or as Dickens calls it, ancient bridge, that stood in one form or another for 600 years is the setting described in his 1837 novel Oliver Twist even though it had been demolished c 1831. The stairs in the story consist of three flights and lead to the River Thames. The current structure is a single flight that ends a half city block from the river. - AsNotedIn

The steps to which the girl had pointed, were those which, on the Surrey bank, and on the same side of the bridge as Saint Saviour's Church, form a landing-stairs from the river. To this spot, the man bearing the appearance of a countryman, hastened unobserved; and after a moment's survey of the place, he began to descend.

These stairs are a part of the bridge; they consist of three flights. Just below the end of the second, going down, the stone wall on the left terminates in an ornamental pilaster facing towards the Thames. At this point the lower steps widen: so that a person turning that angle of the wall, is necessarily unseen by any others on the stairs who chance to be above him, if only a step. The countryman looked hastily round, when he reached this point; and as there seemed no better place of concealment, and, the tide being out, there was plenty of room, he slipped aside, with his back to the pilaster, and there waited: pretty certain that they would come no lower, and that even if he could not hear what was said, he could follow them again, with safety.