This is for strictly mildly interesting material. If it's too interesting, it doesn't belong. If it's not interesting, it doesn't belong.
This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
Just post some stuff and don't spam.
Little bit surprised that Spain (#5 and #7) has bigger cities than Germany (#8 and #10), but now I think about it, it does make sense.
Is that a radius or diameter of 30 km?
Seems to be radius
If it's for a fixed area it'll be the "highest population density" not "largest". At 30km radius I'm not sure you've even included all of Greater London.
“in Europe”
All of those are European cities?