The Solomiya Krushelnytska Lviv State Academic Theatre of Opera and Ballet or Lviv Opera is an opera house located in Lviv, Ukraine's largest western city and one of its cultural centres. Originally built on former marshland of the submerged Poltva River, the Lviv Opera now located on Liberty Avenue, the tree-lined centrepiece of Lviv's historic Old City, …The Solomiya Krushelnytska Lviv State Academic Theatre of Opera and Ballet or Lviv Opera is an opera house located in Lviv, Ukraine's largest western city and one of its cultural centres. Originally built on former marshland of the submerged Poltva River, the Lviv Opera now located on Liberty Avenue, the tree-lined centrepiece of Lviv's historic Old City, a UNESCO World Heritage Site located in the city's Halych district.