We simply thought that we would be considerably poorer in Europe if we didn't have the sacred buildings of earlier epochs. It's still possible to experience the Gothic period, not to mention the Romantic. Only nothing remains of the industrial age. So we thought that our photos would give the viewer the chance to go back to a time that is gone forever.
The question if this is a work of art or not is not very interesting for us. Probably it is situated in between the established categories. Anyway the audience which is interested in art would be the most open-minded and willing to think about it.