dynamic graphical clickable site map for sharepoint 2013

Hi all

I’m searching info on how to go about integrating a dynamic graphical view of all sub-sites under a given site collection 

this site map would ideally be 

– graphical (like a mind-map) 

– dynamic (timer or event based ?) so that whenever a sub-site is added/deleted somewhere the graph gets updated.

– clickable, clicking a node brings you to the sub- site

This is not an administration tool, but should be integrated in the end-user facing UI

Does this already exist ? (I would hope), maybe SP 2013 out of the box ? (remember I’m a beginning beginner in SP) or to develop ?

thanks