"I love going to the opera house."

Translation: J'adore aller à l'opéra.

[KitteryKar]

It would have been nice if we had been warned that there is no difference between Opera and Opera House.

[Cazzam424]

Isn't there a difference between 'opera' & 'opera house'?

[Liz160065]

Surely it should be au opera as opera is masculine?

[ZarrouguiL]

It is masculine. But "au" is the contraction of à + le. However à + l' always stays the same. In other words, you won't ever find "au" before a noun beginning with a vowel sound.