I should note that St. Paul's Basilica is not the cathedral of the Archdiocese of Toronto, which is instead St. Michael's.
Here is a taste of the Basilica of St. Paul's.
The aforementioned Flickr set will give you even more details of this splendid basilica church. I am certain some of you will be interested in seeing a historical view of the church, most particularly the sanctuary, and the Toronto Catholic provided a link to a history of the parish which included these two photographs.
In addition, I could not resist also showing you these images of the church of St. Mary's, also found in that same city:
