I stood by the sarcophagi of more than 1,000 years, staring at the incredible golden wall between the altar and the church, staring at the ancient mosaics, feeling the history. There are quite a few English explanations explaining what’s inside and their age etc, if you want to see all the buildings here it can take 30 minutes to a few hours, our visit is about an hour. Very worth coming here to see, the exterior and interior are beautiful.