Oh, there are places like that in Portugal too - for example Albufeira in Algarve.

They're never large living cities which transformed into pure touristic cities but rather custom made from the ground up Tourism places or places that started as small villages with some small-size primary sector activity (fishing villages being quite common) and were discovered by tourists and just exploded in size catering to Tourism, crowding out the original economic activity of the place.

Personally I see them as basically Large Resorts (since either there was not even a village there originally, or the built-up area for Tourism vastly exceeds the are of what was originally there), but I'll grant you and @criticon@lemmy.ca (who mentioned Cancún) that it makes sense to call them cities, in which case I explained myself incorrectly in the first paragraph of my post - what I was really thinking was that there are no places which were originally cities that turned 100% to Tourism and that's not what I wrote there.