Here's a list of awesome places i've been to that I suggest you check out.
Britain
-Salisbury Plains (Stonehenge and Salisbury Church are amazing)
-Tower of London (London in general is very cool)
-Cliffs of Dover
-Town of Baath, Roman Baths are there, probably the most picturesque spot in Britain that i've seen.
France
-Gah where do I start, everything!
-Normandy Beaches
-Dieppe
-The Somme
-Port of Calais
-Vimy Ridge (even if you're not Canadian it is one of the best preserved battlefields of WW1 in Europe, it's a jaw dropper)
-Waterloo
Netherlands
-Amsterdam of course, just don't wander alone at night.
-There's a miniature village somewhere close to Amsterdam that is a massive mini model of Amsterdam itself, cool shit if you're around there.
-Take a canal cruise of Amsterdam, feels like Venice.
-Anne Frank House
Belgium
-Check out Brussels, awesome night life, I wish I got to see more of it.
More to come in a bit!