ShannonCT
Deity
They also do appear on the map, and have therefore a map-location. The location is where-ever the wonder is built that (pops/discovers) them. If you want to pillage/capture the resource, you will have to raze/capture the city, similar as if someone settled a city ontop of an iron resource.
They don't appear on the map the same way other resources do. This article is supposed to help newbies decide where to settle cities. Hit movies/records/musicals have no relevance here.
They increase the value of the terrain by a LOT! Each separate resource tile gains 50% culture boost. This is of course stackable if you decide to combine them in/on the same city/tile.
The resources don't give tiles a 50% culture boost. The wonders do. It's completely different.
Nice article titanvol. No need to include the Hits resources, or oil/coal/horses for that matter, which can affect health/happiness in certain scenarios.