The super neat vid below created with help from the Museum of London Archeology shows the city's development from roughly the birth of Christ all the way up to the modern day. Info relating to the city's gradually expanding system of roads and buildings is impressively displayed, complete with a timeline and awesome trivia. Did you know the Romans referred to London as "Londinium"?
See the birthplace of Gary Oldman and Kiefer Sutherland (yes, really) go from this...
And beyond, up to the present day. Check the vid for yourself, which concludes with this message: "What Will We Destroy, Protect, and Reuse in the Future?"