The Lithuanian National Opera and Ballet Theatre is Vilnius's main stage for large-scale classical performance. Its broad Soviet-era building near the Neris is not subtle, but it carries real cultural weight and gives the city an evening option beyond bars and old-town restaurants.
Check the programme if you are in Vilnius for more than a night. Tickets can be good value, and attending a performance is a useful way to see local audiences using a cultural institution rather than simply walking past another monument.