Gregorian Chant at Mosteiro de São Bento (Sao Bento Monastery)
Sunday mornings at the Basilica de Nossa Senhora da Assuncao are filled with a fog of incense, the drone of Gregorian chanting, and sunlight filtered through massive stained glass windows. This twin-towered church and monastery was designed in the early 20th century and features a large organ with over 6,000 pipes. Get there early on a Sunday at 1000 to gurantee a spot in the pews.