The wonderful new Copenhagen Opera House, now amongst the most modern opera houses in the world, is located in central Copenhagen on the river.  It is also one of the most expensive opera houses ever built, with a construction cost of over USD 500m donated by the Moller Foundation, which was the co-founder of the shipping company now known as Maersk.  It opened in 2005 and can seat up to 1,700 people with a large orchestra pit that can fit 110 musicians.