After visiting the Igreja de Santa Maria do Castelo (a former mosque), I walked downhill to see the old town of Tavira. A big block of old city walls was rising above a house. Few metres down the road, I could see more fragments of the defensive wall.
Then there was the Church of Santiago, this church dates to the second half of the thirteenth century built on the site of an old mosque. There is a second door, which provides access to the main altar of the church but there was a mass in progress so I didn’t go inside.