Magnificent buildings can be created if you can hire a talented team of architects and have unlimited budget like the Vatican.
Aside from the skilled craftsman and artists employed in the construction who benefits from them?

I did a project on Christopher Wren when I was in high school and I went on a tour of Europe (including England) right after graduation. I had to go visit St. Paul's Cathedral, of course. I revisited St. Paul's again later on in my life. It's one of my favourite buildings. I was also an admirer of John Donne's poetry. He became the Dean of St. Paul's at one point. I had to see John Donne's effigy, of course. I was such a weird teenager who was into art, architecture, history, and literature.

Considering the time of construction. The art of designing and constructing such a magnificent building is amazing.

A fine example of the Vatican s extraordinary real estate holdings all over the world making it rich beyond anyone's imagination, so much for the Catholics wanting to help the poor. It has been estimated that just 1/3 of the Vatican's richness distributed among those less fortunate would completely eradicate all the poor in all the world. But would they do it? Not a fucking chance! Because they prey on the poor to exist.

Kinda reminds me of something....hmm.
Oh yes, derivative American architecture. This Capitol building in my home state of Washington, town of Olympia, was a view from my house when I was little. Washington did not even become a state until 1889. Interesting to see something so much older.
I believe several state capitols have similar domes.
[google.com]

I've always wanted to live in an old church with a graveyard in the back.

People can create such beautiful architecture and art if you can look past the religious overtones.

The music and architecture created by and for the Catholic church was, at times, outstanding. Another example of you don't have to like or agree with the artist to enjoy or appreciate the art.

Wonder how much slave labor was used to build it.