Identify unused pages – how?

On my website I have many pages – some from a supereced version of the website which were imported but never used and, as far as I am aware, aren’t accessible via any menus or links from other pages.

It’s not as simple as seeing which are linked from the main menus though, as I am using geodirectory and it calls various different pages at times, which are not available directly via the drop down menus.

How would I go about finding:
1. Pages not used?
2. Pages not linked to other pages?

I’d prefer a direct way of doing so however if there is a suitable plugin I could install, use and then uninstall I am happy to hear about it too.

Thank you.