Use Google Maps to make a Tree Structure as in Khanacademy.org

Question

I was just surfing out the site Khanacademy.org, and just seeing their practice session, when i came across this page, Here I saw something odd, they use google maps to create the structure shown below:

Now I am wondering that how can they make use of Google Maps to create a course structure tree like this?

PS - If you can't see the link to this page directly, then I think you need to register.

Answer 1

Here's how they did it