@bastianallgeier I drove from Dresden to Prague with spare time so didn't keep to a route, and remember the astonished joy when I went over a little bridge and realised I was in Poland.
Going along the road beside the river was a revelation. Sticks in the ground on each side, painted with the colours of the appropriate flag. The river is not wide - a serious long-jumper could cross it - and THAT is a border? What nonsense humans perpetrate.