Walking around a residential area in Luxembourg, I noticed that each home had their wheelie bin for general rubbish in the front yard strangely placed in a neat, concrete-lined pit.
It wasn't everywhere in Luxembourg, but nor was it just one home-owner - I saw at least 20 properties in a row that had it, suggesting it was a local ordinance rather than a personal choice.
I have shown this photo to many Europeans, who have expressed surprise and come up with many wild speculations, but I haven't found a Luxembourger to explain the practice.
Why are the rubbish bins "buried" in this way?