As ex-Army I have a passion for military history. I have done numerous WW1 and WW2 battlefield tours both on my own, and with mates (some ex Army). The Bridge too Far tour is a good one we did in 2011 - I wrote it up here:
Bridge Too Far tour 2011
If you go to Bastogne, there is an old sherman tank in the town square which you can clamber over as most tourists do.
WW1 is my main interest and we did a great tour in 2010 - I wrote it up here:
WW1 Band of Biker Bros Tour 2010
Sere Road along the Somme front is a sight to see. If you get to high(ish) ground you can see along the front line as it winds through the countryside and the numerous memorial graves line the front.
A real eye opener is the Pals Battlaions memorial with each of the pals battalions memorial fixed to the trees. We also visited some of the poor souls who were "shot at dawn" including the only gravestone who mentions that the soldier was indeed shot at dawn.
Try arranging a stop at Avril Wimmiams guest house at the small hamlet of Auchonvillers on the Somme. A - its a crackingly good value guest house B - they have onsite food and beer and C in their backyard is the original Somme front line first aid station and trench system.
The Canadian memorial at Beaumont Hammel is also worth a visit, and climbing to the top (where the statue of the Elk overlooks the battlefield) you can see how close the German and Canadian trenches were to one another.
Along with Menin Gate and Theipval memorials you ought to consider visiting the German cemetary near Ypres. You will notice the difference between the quality of the upkeep of the German graves and the Allied ones. Anyways, inside the German cemetary at Annœullin is the grave of Captain Albert Ball - who was crashed whilst pursuing the Red Barons brother and received 2 Victoria Crosses. He was buried in the German cemetary by the Germans with full military honours as pilots were recognised as the braviest of the brave.
Moving on, try and vist the Canadian memorial for the battle of Vimy Ridge - its another one of those incredible memorials.
All in all, its hard to make a bad choice visiting either World War memorials. There are so many, and the locals/CGWC maintain the memorials to an exceptionally high standard.
As a side note, the riding roads between the memorials are great but if your like me, you will tend to spend the time travelling the roads thinking about the ultimate sacrifices made by these people.
