Yep, that’s not a castle but a church, more precisely a Basilica Cathedral. But titles don’t say so much to me, but I know is that I like the work of the builders with the volcanic white rocks. Neo-gothic towers upon its neo-classic façade designed upon a previous one by architect Lucas Poblete in XIX century.
Nevertheless instead to be dedicated to religion I’d prefer that these buildings would be destined to things as white castles for love or happiness. It’s just a personal desire after years to see them in the childhood like extraterrestrial buildings for its great coldness. This because it’s so different to our traditions to celebrate with parties and dances the earth, the life and the seasons in the nature contrasting with the closed and dark spaces of sorrow inside colonial churches, with bloody iconography and apparently a ban to everything that brings joy to life. I think modern Christians think the same judging from the contemporary churches with views to lakes, parks, and with tons of soft light that make a better place to calm the spirit.