Either you need to be looking for a WMS Map Server with embedded Data.
Or you need to find the Raw data which can then be used to visualise as above within Tableau.
thank you for the input. Since I'm not very familiar with WMS Map Servers, can you recommend me one or two?
Thanks a lot!
Here is one for you to try.
But if you type WMS Map Server in Google you will come across plenty. Some are paid services and some are free.
Also here is a previous thread on Map Servers maybe one of the links in this thread will help you