The strong religious tradition is really obvious from the number of big and small churches that you find one after the other, each with their own special atmosphere and individual architectural style.
Naples itself is a real open-air museum. The ancient buildings that people still live in, the thousands of churches and the museums leading from the centre to the outskirts trace a historical and cultural profile which is unique to this city.
There are lots of different tours you can take. The site suggests an itinerary that takes you through the old part of the city but stops at various points to admire reminders of a much more recent past.