https://www.aria-database.com/
You can find all the world's opera theaters through the navigation links below Operrissimo's page
Suffolks university opera guides
Contact us if you need help to information retrieval e.g. within the field of music.
Helsinki: lib.siba@uniarts.fi
Kuopio: lib.sibk@uniarts.fi
See also How to search music in Arsca