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Coyld you name a few of those "many"?

Scandinavia, Germany and down to the metiterranean and everything east of incl. Croatia I think it's all shoes off?

From a quick search it seems like west of Germany, Italy and Greece are mostly shoes-inside countries. I definitely wouldn't say that's ultra common.

I met many shoes indoors houses in Germany...again, anecdata ;-)

Having lived for years both in Germany and Greece, definitely shoes off inside. Can't say anything about Italy though !

Spain - most people wouldn't ask guests to take their shoes off