Retrieve the site hierarchy from the URL

Hello,

As a web design student, I need to create a graphic redesign of the website for the organization where I'm interning.

I need to retrieve the structure of their website: that is, to gather all the existing URLs from their website in order to redesign the pages.

I don't need to retrieve their lines of code: I just need to know which pages exist and what links the pages have between each other (URLs) so that I can replicate the site's structure identically.

Thank you for your help.