If you want somewhere peaceful to reflect, pay a visit to Almas Chapel. This house of prayer offers a wonderful respite from a hectic travel schedule.
You'll soon see why this Centro / Baixa house of prayer is popular with travelers. If you're looking for more to do and see here, Sandeman Cellars, Porto Cathedral, and Casa da Musica are in the area as well. They won't take you long to reach from Almas Chapel.