Splendour of the Catholic Church by Scott Hahn
If you don't already feel proud and privileged to be Catholic, then you need to read this! Scott Hahn was an Evangelical Protestant before coming to the conclusion, through his studies, that the Catholic Church was the Church founded by Christ Himself. This article is long, but inspiring!
The Marks of the True Church by Paul McLachlan
In the Creed, Christians pray that they believe in the "one, holy, catholic & apostolic Church". This article explains what those terms mean and why only the Catholic Church has each of those four "marks".
The Hierarchy by Paul McLachlan
Christ established the Catholic Church as a hierarchy. This article explains what the hierarchy is.