The... steeple, I think it's meant to be? Also kinda looks like a mistake, rather than something done on purpose.
The inside's OK but I concur with it still being one of the uglier "nice" churches I've ever seen. Overall looks like it'd be better as, I dunno, part of a monastery or something? Maybe Tony Stark's vacation home or something, from the better angles.
Hacker News art criticism at its best.
Absent context I'd definitely take the mismatched-windows exterior shot as the result of something like the Internet-famous time that amateur (in Spain, I think?) tried to restore a painting of Jesus.
[EDIT] My point is, if someone told me some other parts of the building were a mistake, much less something like the Sistine Chapel, I'd be like "no way". That particular view of the building? Someone told me it was a mistake, I'd be like "haha, yeah, clearly, hope they fix it so it doesn't keep dragging down the rest of the building"