 When you reach an impressive plaza with a 16th-century church and whitewashed town hall, you may feel that you've come to the top of the town but you haven't.
You haven't come to the top of the town when you reach an impressive plaza with a 16th-century church.
mnli hypothesis: You haven't come to the top of the town when you reach an impressive plaza with a 16th-century church. premise:  When you reach an impressive plaza with a 16th-century church and whitewashed town hall, you may feel that you've come to the top of the town but you haven't.