These 'pay what you want' walks are exhaustive explorations of London, with this one focusing on the route from St Paul's to Monument. Along the way expect factoids and snippets about bridges, theatres, prisons, prostitutes, wars, pubs, fire, plague and more bridges. And more wars. Starting point is St Paul's, check the website for exact location.

Bowl of Chalk: St Paul's to the Monument
Time Out says
Details
Discover Time Out original video