Have a look at this link on wikipedia for information on the Sé de Lisboa.
(Sé Patriarcal - Lisbon Cathedral)
http://en.wikipedia.org/wiki/Lisbon_Cathedral
The Dioscean Website shows that at the time of writing Mass is said at:
Sé Patriarcal - Tuesdays to Saturdays at 18:30
See: http://bit.ly/1bWn1NI
