NSW Suburbs: What's in a name?
Did you know that 227 towns in New South Wales are named after UK towns? Well this double Google Map shows you all 227 NSW towns and shows you the location of their namesake in the UK.
The towns are displayed on both Google Maps and listed in the map sidebar. If you click on a town name in the sidebar both the New South Wales and UK map will centre on the chosen town.
If you want to produce a similar map for the namesakes of US towns you can view the code for the map at github. Alternatively you could create a dual map showing the cities/towns other cities/towns were twinned with.