There are a number of memorials in the Somme region. Canada was granted a square kilometre of land on which to build its memorial, and the Canadians at the time decided it would be best to leave most of it untouched. So most of the undulating lawn is fenced off because it still contains mines.
The site is hosted by Canadian students (I have to admit, I found the Canadian English there very pleasing to the ears) that work at the interpretive centre and give tours, including a tour of the shallow part of the tunnel system dug by the British. The site also includes trenches that have been kept up for touring, so that one can get a tiny sense of what the place looked like nearly 100 years ago during the war. We arrived in time for the last tunnel tour of the day with a group of boisterous Welsh boys on a school tour and a few other Canadians.
The tunnels are about 10m down, and you spend a good half hour down there seeing the various tiny rooms where things went on (officers' quarters, planning room, munitions). They packed over a thousand troops down there before the big "Over The Top" assault, and it's hard to imagine . . . it is not great down there even with the modern ventilation that has been added for tours. There is also a system of tunnels at 30m below the surface, which are not considered safe for tours, though they have been explored. The Germans also had tunnels at that depth, and apparently the two systems ran into each other at some point.
Thank you to Patricia from Newfoundland, our guide, who gave an excellent tour and managed the enthusiastic kids very well.
The memorial itself is a massive structure (you may have seen it if you've watched a Rememberance Day service on tv). Walking around it, I found the sense of history and loss very powerful.
I would recommend that anyone, especially Canadians, visit this memorial site if you are anywhere in the area (it is not too far from Paris).
Lest we forget.