Is there anyplace where you can look at the terrain or maybe what is left of the trenches or similar? In the Somme or other place? That is something on my bucket list (something you just gotta do before you "kick the bucket" aka die)?
There are still many places where you can visit trench remnants, though for them to be recognizable as trenches they do have to be regularly cleaned out and kept in halfway decent condition. Unkept trenches are barely recognizable now unless you know where to look. But once you have identified a specific battlefield area, you can often find many remains of trenches, especially in eastern France or areas around Reims and Verdun.
Around Ypres in Belgium there are several private museums such as for instance Sanctuary Wood museum
http://www.greatwar.co.uk/ypres-salient/museum-sanctuary-wood.htmIt's a nice old fashioned museum, with rear area trenches that were preserved immediately after the war by the owners of the property who started a museum in the 1920's.
There is also Bayernwald - German trenches recently restored. It is said that Hitler was stationed here for a while.
http://nl.wikipedia.org/wiki/BayernwaldAround Notre Dame de Lorette in northern France, trenches are still to be seen in a local museum adjacent to the cemetery. This is a haunting site of great beauty and sorrow and one of the most beautiful in France.
http://en.wikipedia.org/wiki/Notre_Dame_de_LoretteVauquois - a ridge in France in the Argonne nearby Verdun, also has preserved trenches, mine craters and many underground passages. To visit these underground passageways you must make reservations, but they are well worth the visit, eerie and desolate and places of absolute darkness. The open air trenches are always open for visits.
http://www.worldwar1.com/france/vacquois.htmThere are also trenches near les Eparges, and many others not far from St Mihiel in France, the American sector from 1918 onward.
http://pierreswesternfront.punt.nl/index.php?r=1&id=415109&tbl_archief=Also a vast battlefield of trenches exists at Vimy, near Arras. This was first held by French troops and later by Canadians. Here also you can visit underground shafts and tunnels.
http://en.wikipedia.org/wiki/Canadian_National_Vimy_MemorialThese are but a very few of the many trench remnants. Along the Somme battlefields you will find many small areas of trenches and mine craters.
There are also the battlefields of Verdun, which abounds in remains of all kinds and the area around Reims, the Fort de la Pompelle and other areas nearby in the Champagne where the late 1915 offensive was started.
Actually there are just too many to list. For a concentrated area where distances are not far from each other, the Ypres area might be the best place to go.
There are also quite a number of photos in the link in the first post above of some of the places mentioned.
And aside from trenches, it should be noted that forts of all kinds played very important roles in the Great War - from the Verdun forts of Douaumont and Vaux, the Fort de la Pompelle near Reims, the forts of Maubeuge, Antwerp and the wonderfully evocative Belgian fort of Loncin near Liege in Belgium.
http://www.fortdeloncin.be/There is also a nicely restored fort of Liezele near Brussels Belgium which was besieged during the fighting in Belgium from August-October 1914.
http://users.telenet.be/bart.van.bulck/These can all be visited. You can look up the info on the Net should you be interested.