Project management software that has a zoom-able interface?

I love trello to death. It's wonderful for putting together a list of things to do. What I would love even more is a better way to organize my project. Is there a piece of software out there where I can nest tasks like Russian nesting dolls, and navigate like Google Maps through them?<p>I know it sounds a little silly, but it seems like that would be a great way to navigate a large set of tasks easily, and to be able to see the status of a project (if the sub-tasks update the parent tasks in some way).<p>Any thoughts or suggestions?