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My parents spent 3 months in Paris (they usually live out in the west of France) by Stalingrad a couple of years back. They were shocked at the sheer volume of people sleeping in makeshift shelters and tents there. Used to be a huge encampment alongside the motorway on the way into Paris from the east but that got cleared after the pandemic I think.
Even in Luxembourg you find small tent "villages" hidden in the wooded parts around the city.
As you say, all of Europe.
All of Europe has a big homeless problem right now it just depends where you are whether you see it or not. When I was living in London in forest gate I saw a bit but not tent city levels but now I'm living in Lyon bang in the in the city I see way more. Loads of tents in underpasses, the local authority put out portaloos which at least shows a basic level of humanity but it's miserable to see, especially now the weather's turned, it must be horrible.
Not saying the UK situation isn't particularly bad but the cost of living crisis is a nightmare all over Europe.