Melbourne:

Melbourne's live performance institutions date from the foundation of the city, with the first theatre, the Pavilion, opening in 1841. The city's East End Theatre District includes theatres that similarly date from 1850s to the 1920s, including the Princess Theatre, Regent Theatre, Her Majesty's Theatre, Forum Theatre, Comedy Theatre, and the Athenaeum Theatre. The Melbourne Arts Precinct in Southbank is home to Arts Centre Melbourne, which includes the State Theatre, Hamer Hall, the Playhouse and the Fairfax Studio. The Melbourne Recital Centre and Southbank Theatre (principal home of the MTC, which includes the Sumner and Lawler performance spaces) are also located in Southbank. The Sidney Myer Music Bowl, which dates from 1955, is located in the gardens of Kings Domain; and the Palais Theatre is a feature of the St Kilda Beach foreshore.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". In what year did the Pavilion open?
1841