Turbines are usually dismantled on the spot. There are companies who specialize in doing that. Again, we are only entering the end of life for some turbines, considering that a large volume of turbines really started appearing around the early 2000s. By the way, those originally did not have magnets; they were done with a different technology, because did not have rare earths.
Once they are dismantled, the blades, for example, will go through a specialized process where they are shredded or used for some sort of composite material or additive materials. The steel will get processed and get shipped towards the nearest recycling centres. There are steel scrap centres everywhere. Then, what's happening now more and more whenever there are magnets is that the magnets are usually collected separately into containers and get shipped to a company that can recycle the rare earths.