Copenhagen Opera House (Operaen), Copenhagen, Denmark. Architect: Henning Larsen, 2004. Detail of glass facade and limestone sid

Copenhagen Opera House (Operaen), Copenhagen, Denmark. Architect: Henning Larsen, 2004. Detail of glass facade and limestone sid

Alastair Philip Wiper-VIEW / Alamy Stock Photo

Image ID: DFW8C7

The Copenhagen Opera House (in Danish usually called Operaen) 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 with construction costs well over 500 million U.S. dollars. It is located on the island of Holmen in central Copenhagen.