The Great Goose Quiz

It maybe, just maybe, a little easier than last issue's bird quiz. This one is all about location. Can you tell which of the Operas was either set in or simply mentions the following locations?
- Barataria
- Castle Adamant
- Castle Bunthorne
- Girton
- Margate
- Mount Olympus
- Peckham
- Pfennig Halbpfennig
- Portsmouth
- Rederring
- St. Mary Axe
- Titipu
- Tower of London
- Tremorden Castle
- Westminster