The big stage, Rock/pop concerts every Friday night.
Rådhuset
The City Hall is open to the public, so you can stroll through the hallways, stairs, and study all the paintings, frescoes, and other decorations on your own. City Hall guided tours in English M–F at 13:00, Sa 10:00, 50 kr. Visit the tower: M–F 11:00 and 14:00, Sa at 12:00, 30 kr or free with Copenhagen Card. There is a nice little garden that cannot be seen from outside the city hall. The city hall is also home of Jens Olsen's World Clock - this mechanical masterpiece of a complete astronomical clock is in the foyer.
the Parliament
This Neo-baroque palace, completed in 1928, after 11 years of construction - is unique in the world, housing both the executive power, the legislative power, and the judicial power of Denmark, in a single building. It is the 5th construction at the site, and the ruins of the original castle dating back to the 12th century - was excavated during the construction of the current palace, is open to the public (adult 85 kr, student 60 kr). Apart from the ruins there are a few other places that can be visited: free guided tours of the parliament building are conducted during summer months; Parliament's tower can be visited free of charge Tu-Su 11:00-21:00; the Royal Reception Rooms (including the Great Hall with the tapestries) 150 kr; the Royal Kitchen 85 Kr, the Royal Stables 85 kr; the Palace Chapel - free admission. Besides, there is a combination ticket which allows entrance to all of the aforementioned sights - 225 kr. You get a discount of 10 kr for all tickets when ordering online.
Det Kongelige Bibliotek, Black Diamond (Den Sorte Diamant)
The library was founded in the 1650s and have an impressive collections of rare books and manuscripts, which includes a Gutenberg Bible, tormented philosopher Soren Kierkegaard's original manuscripts and "Out of Africa" author Karen Blixen's diaries, as well as a newer collection that includes most of the original drawings of the controversial Mohammad cartoons. Changing exhibitions of books and art, often from the libraries own collection, are displayed in a new striking building overlooking the harbor, called the black diamond.
This classical mansion on Kongens Nytorv, is home of several cultural institutions, like the Royal Danish school of Visual arts, and has an art exhibition space, with changing, often world class, expositions - check the schedule at their website.
Amalienborg is the Royal residence and consists of four identical classical mansions, each facing an octagonal courtyard. On the Queen's birthday (14th of January) and for other highlights in the lives of the royal family, the square is jam-packed with people waving the Danish flag and greeting the Queen. There is a museum in the Christian VIII Mansion displaying exhibitions of the period 1863-1972, and four generations of the royal family. There is changing of the guards each day at 12:00. (Marches from Rosenborg Castle barracks) The ceremony is most elaborate in the winter, when the Queen is in residence here; a scale-down version is performed the rest of the year when the Queen is in residence in her other palaces. After visiting the museum, Amaliehaven offers some beautiful views of the new Opera on the other riverside.
The Marble Church, Frederik's Church
Officially called Frederikskirken, this impressive church imposes a massive presence on the Copenhagen skyline, with its 31 m. diameter dome. Because of financial turmoil in the country, it took over 100 years to complete. The church takes its name from the original lower part of the structure which is made from Norwegian marble. Guided tours of the dome: adults: 35 kr, children (under 18) 20 kr (cash only); June 15-Aug 31: daily at 13:00; at other times: Sa Su at 13:00. Tickets are sold from 12:50. Visits might be cancelled due to services or concerts. Services in Danish on Sundays and holidays at 10:30.