The cities of Rotterdam ('the city without a heart') and Dresden still tell a pretty grim tale today if your eyes are open to it, and Warsaw and Poznan have plenty of places where the repair still hasn't caught up with the damage. There isn't a month that somebody doesn't dig up a piece of ordnance (in some cases very large bombs) when working on their houses or doing public works.
Be grateful for the world you live in and strive to minimise war, it wasn't always this peaceful and the chance is that it will not always be.
Europe is still quite anti-war (in spite of the apparent ease with which some countries, including mine joined the Iraq adventure) there are lots of older people here that still remember what it was like. But we tend to forget and when the last of them dies and stops reminding us how bad war really is the risk is very large that past stupidities will be repeated.