Possible Duplicate:
What is the best method to start understanding BIG project source code?

I have a project that I would like to dissect to learn something new from it.

This project is about 200 megabytes. For me, it is just impossible to open every cpp and hpp file and read each and every one.

I also don't know what is the best approach in this case. Many people on the internet are looking for an UML tool to generate some kind of graph. I think that UML works well when you are starting a project and you want to express the business logic of your classes and methods.

In my opinion UML is totally useless when studying a project only from its source code.

Also UML is an OO language, in a large sized C++ project I find a lot of stuff that is not an object and can express some other kind of paradigm.

Can you name a tool or a class of software that can help with this?