I went to the (admittedly altered) battlefield at Waterloo a few years ago and it was a really fascinating experience. For me the most interesting part was when you walked from where Napoleon/etc. were viewing the grounds over to the Allies, it was VERY deceiving. It looks more or less flat, but as soon as you start walking it the ground is rolling so much that you lose line of sight on both the Allied and French starting positions on numerous occasions. That combined with other things such as the aforementioned roads here really gives some insights into why things went the way they did. The Duke was a very clever man when at his best.

That's very true, Babylonian. Siborne's model of Waterloo deliberately exaggerates the relief because if it didn't the ground would look flat.