Selecting region through Maps

[Srijan Shukla]

Hello, 

I want to implement something like this, 

The user is shown the world map with boundaries of continents highlighted and then selects a continent,

Map then zooms, to continent level view and then the countries are highlighted and then user selects a continent, and so on, to state then on to city view.

Then in the city view I want to put some markers according to the data I have for that particular region view.

I'm a newbie, so can someone guide me on how to go about this? By far, the only part I'm capable of implementing is putting markers on the map. 

I have no idea how to go about the rest of it. Thanks in advance!