My wife and I were lucky enough to catch a guided tour of this historical building. Despite its name, it's not a Catholic cathedral, but instead belongs to the Church of Ireland, which is Protestant, and is similar to the UK's Anglican or the US's Episcopalian Church.
The cathedral started out Catholic, as it was built before the reign of Henry VIII, and it did change back and forth several times till the end of the 17th century.
Our guide told us that a lot of renovation work was done in the late 19th century, with support from the Guiness family.
Among the famous people buried here is Jonathon Swift, who created Gulliver's Travels.
I was impressed by the size of the building and the gigantic arches.
The tour was the perfect was to end our visit to Ireland, as we left for the US shortly after our visit.