How to visualize our entire site to discover the origin of URLs?

[poolguy]

What is a tool to use so that I can visualize all links to all pages on the site so that I can discover how certain duplicate content URLs are being created?

[RyanKent]

If you set up a SEOmoz campaign, the web crawl report will offer that information. If not, you can request your site to be crawled: http://pro.seomoz.org/tools/crawl-test

[poolguy]

What if I need 150k pages crawled, rather than 20k?

[RyanKent]

I believe this tool will meet your needs.

[poolguy]

Yea, I've seen that before.  Will that show me how unwanted pages are being referenced?

[RyanKent]

I have not used the tool in quite some time but if I recall correctly it does offer a referring page URL. I can't imagine it would be useful without that information.

[magicrob]

SEO Spider from Screaming Frog is a great crawler and a notable alternative to Xenu