If you’re ever working with a site that just won’t load and you don’t know it’s structure, you can (if it isn’t severely busted) still attempt to access other pages by manually navigating to the “View All Site Content” page, by adding  _layouts/viewlsts.aspx to the end of the site URL.

E.g. http://intranet/_layouts/viewlsts.aspx

If you still have troubles with the site, then you can attempt to navigate to the site settings page and modify the settings that might be causing the issue by adding _layouts/viewlsts.aspx to the end of the site URL:

E.g. http://intranet/_layouts/settings.aspx