Copenhagen Opera House
The Copenhagen Opera House is the national opera house of Denmark, and among the most modern opera houses in the world. It is also one of the most expensive opera houses ever built [citation needed] at a cost of 2.5 billion DKK. Architect Henning Larsen and engineers Ramboll and Buro Happold and theatre consultant Theatreplan designed the facility. Construction began in June 2001 and was completed on October 1, 2004.