Details: https://www.theguardian.com/cities/2016/jan/25/how-london-might-have-looked-five-masterplans-after-great-fire-1666 https://www.theguardian.com/cities/2

Details: https://www.theguardian.com/cities/2016/jan/25/how-london-might-have-looked-five-masterplans-after-great-fire-1666 https://www.theguardian.com/cities/2016/jan/25/how-london-mi... I don't think Wren's plan looks very concentric or ring-like. He also got to rebuild St. Paul's to a completely new design, in those years. Maintaining the original plot boundaries, as the city was rebuilt, naturally didn't interfere with the cathedral.