This was the most entertaining and educational history video I've ever seen: Drive Thru History with Dave Stotts: Rome if You Want. I learned so much about the ancient Romans, the rise and fall of the Roman Empire and the people and events that still have an impact on our world today. Highly recommend it!
The complete book of the Olympics by David Wallechinsky and Jaime Loucky
Gold by Chris Cleave
How to watch the Olympics: the essential guide to the rules, statistics, heroes, and zeroes of every sport by David Goldblatt and Johnny Acton ; diagrams by Belinda Evans