The Opera is part of The Royal Theatre and has been the main venue for opera and ballet since its inauguration in 2001. The old Royal Theatre on Kongens Nytorv has an amazing atmosphere and centuries of history, but the stages are more suited for theatre than performances that include music, like opera and ballet.
In 2000 a Danish shipping magnate decided to donate a new opera to Copenhagen and Denmark, which should be state of the art for musical performances. About 500 million US dollars and 4 years later the new opera house was handed over to Denmark, represented by then Prime Minister Anders Fogh-Rasmussen, and the Royal Theatre people moved in and made it their new work place.
There have been issues that needed to be dealt with, like that the orchhestra grave was designed to hold a full set of musicians to perform eg. Wagner operas, however the Danish workers safety authorities have forbidden that many performing musicians to sit that close because of possible hearing damage. The acoustics have been tweaked extensively to make the sound as perfect as possible.
The Opera was designed by architect Henning Larsen and has 41.000 square meters or 441.300 square feet of floor, in 1.100 rooms and 2 stages - the Main Stage has 1.500 seats and Takkelloftet 200 seats. There are 5 floors above ground and 9 below ground. The facade is covered with Jura Gelb, a North German calciferous stone, and the wood used inside is Maple and stained maple veneer.
The Opera was inaugurated on January 15, 2005, and every performance has been pretty much sold out since. It's worth noticing that there are 25 tickets held for sale for every performance on the day of performance with a max of 4 tickets per person at the counter. If you show up when the Royal Theatre Ticket Office on Kongens Nytorv opens in the morning you may be able to buy a ticket for a performance later that day.
It's easy to get to and from The Opera by public transport, there are both buses and water buses bringing spectators to and from it before and after the performances, which is fortunate as the location on the area of the former Copenhagen naval base Holmen is somewhat difficult to find, and the number of parking spaces limited. It is easier to keep an amazing performance at The Opera in mind if you don't have trouble getting there and back, which would be a shame, the acoustics and the performances are easily of international class and should be fully enjoyed.