Mapping Internal Links (Which are causing duplicate content)

[BedeFahey]

I'm working on a site that is throwing off a -lot- of duplicate content for its size. A lot of it appears to be coming from bad links within the site itself, which were caused when it was ported over from static HTML to Expression Engine (by someone else).

I'm finding EE an incredibly frustrating platform to work with, as it appears to be directing 404's on sub-pages to the page directly above that subpage, without actually providing a 404 response. It's very weird.

Does anyone have any recommendations on software to clearly map out a site's internal link structure so that I can find what bad links are pointing to the wrong pages?

[AdamThompson]

You could try: http://validator.w3.org/checklink