An interesting piece in The Guardian about various schemes that would have created a different London. From straightening the course of the Thames, eliminating the Isle of Dogs loop, to a monorail network in central London above the traffic. From a huge pyramid replacing Trafalgar Square, to a 70-metre statue of Britannia1. Handy for those times when your party end up in an alternate version of the city, or need a definite sign that history has been altered. There are more images here and alternate visions of the rebuilding after the Great Fire of 1666 here.
1 That's 50% taller than the Statue of Liberty.
Time, time,time, see what’s become of me. While I looked around for my possibilities... My AITAS files.