How are WW1 or WW2 era bombs still regularly found in gardens and houses around UK and Europe?

Question

The day after or week after these were dropped 60-100 years ago, did people not think, there’s a bomb over there we should make it safe.

Edit: I singled out the UK because they discovered a bomb from World War Two today in Plymouth. I know the UK is still in Europe.

In: Other

Answer 1

Even provincial cities like Plymouth were bombed on 40-50 occasions in WW2 , city centres were devastated and that was the bombs that were on target. Bombing by eye at night wasn’t at all accurate and many bombs failed to explode on impact. So yes we still have unexploded bombs.