Google just published a new collection of Geographic Web layers for Google Earth, which includes a Wikipedia layer. Those of you who are familiar with Wikipedia know what an amazing resource of information it can be.
Many (but certainly not all) Wikipedia entries are included in this layer. This means that when you check this layer, Wikipedia points of interest (POIs) display for locations around the world. Simply navigate to the area you are interested in and click any relevant Wikipedia POIs to view Wikipedia content that describes the area, city, landmark, etc.
To enable this layer in Google Earth, in the Layers panel, check the Geographic Web folder or open that folder and check Wikipedia. Learn more about layers here.