“I went to THE post office”, “I went to THE train station”. These are typically used without context, and are exceptions that confuse learners, particularly those who are learning about articles for the first time.

Regarding “I go to Church”, the verb to go here doesn’t actually mean movement, it’s a euphemism for “I worship”. Same with “temple”. If you say “I go to a/the church” you are actually stating movement towards a definite or indefinite place.

Again, these are challenging subtleties for language speakers where all nouns are conceptual. And most native speakers can’t explain these exceptions spontaneously