The Tiergarten in Berlin has become one of my favorite parks and running tracks. Even though the longest (good) loop is only 4.3km, repeating it six times somehow doesn't feel overly repetitive. And today I learned that it has a long and fascinating history, and most of the trees there today are under 80 years old.

Yes it's a perfect running spot! Come and run the marathon here once. It's a great race and a really nice and flat track!

Another park with history and nice to run is Volkspark Friedrischain: https://en.wikipedia.org/wiki/Volkspark_Friedrichshain

You can run ontop of a hill that has a bunker in it. (I go there daily)