I often walk around London and just let the history seep into me.  Today when I walked to get my lunch was no different.

And when I got back to my desk I came across this excellent link to a panorama of the city from 1845.

Here it is in a google maps execution  http://www.ianvisits.co.uk/maps/london_1845_panorama.php

And here are the original images joined together.