Web Parts Maintenance Page - fixing a SharePoint page with faulty Web Parts configuration

If you ever use Site Aggregator Web Part on the default.aspx page of a site and configure it in a way that redirects users to some other website (specified when adding Site Aggregator) every time they try to open the SharePoint site (I have no idea how I managed to do it), you can use the Web Parts Maintenance Page to resolve this problem. Of course, you can use this page to troubleshoot all other kinds of problems caused by Web Parts misconfiguration.

The URL of the Web Parts Maintenance Page is:

http://SITE-URL/_layouts/spcontnt.aspx?&url=%2fPAGE-WITH-WEB-PARTS.aspx