Opernhaus Kiel is the major venue for opera, ballet, and orchestral performances in Kiel, and home to Theater Kiel. It is a Grade II listed building.
Wikipedia https://en.wikipedia.org/wiki/Opernhaus_Kiel
Address 4 Rathausplatz, Kiel 24103, Germany
Coordinates 54°19'23.221" N 10°7'59.229" E