As I wrote in another comment, I think the Sagrada Familia is a worthy successor for the grand gothic cathedrals you mentioned, because Gaudí made the most out of late 19th century technology, same as the medieval builders made the most out of the technology available at their time. I mean, just look at those branching columns: https://de.wikipedia.org/wiki/Sagrada_Fam%C3%ADlia#/media/Da... But, to each his own.
I would like to add two (former) churches to your list: the Hagia Sophia (it's really humbling to think that it was already standing for 900+ years when the Turks conquered Constantinople 500+ years ago) and the Pantheon in Rome, which despite being several centuries older, had the largest dome in the world for more than 1000 years.
I would like to add two (former) churches to your list: the Hagia Sophia (it's really humbling to think that it was already standing for 900+ years when the Turks conquered Constantinople 500+ years ago) and the Pantheon in Rome, which despite being several centuries older, had the largest dome in the world for more than 1000 years.