All national museums in Denmark are free to enter for under 18s. Adults have free entry to the Danish Music Museum and the Post and Telegraph Museum, both in Copenhagen. Other national institutions have special free-for-adults days. They include:
Ny Carlsberg Glyptotek, Copenhagen (Sundays)
Royal Arsenal Museum, Copenhagen (Wednesdays)
The Hirschsprung Collection, Copenhagen (Wednesdays)
Danish Museum of Hunting and Forestry, Hørsholm (Wednesdays)
Royal Danish Naval Museum, Copenhagen (Wednesdays)
Thorvaldsen Museum, Copenhagen (Wednesdays)
Danish Architecture Centre, Copenhagen (Wednesdays, 5pm to 9pm)
Museum of Copenhagen, Copenhagen (Fridays)
If you are visiting Ebeltoft, Odense or Ribe you can join one of the town crier’s walks and get a free introduction to the history of the city. In Copenhagen in summer, you can join a New Copenhagen Tours guided walk in the city. The guides are volunteers and you decide how much you think they should get paid. Another option is to join one of the Museum of Copenhagen’s free city walks, which take place every Sunday from May until September.
In several major cities you can also pick up free podcasts and podwalks for your smartphones and let them guide you through the town. Search the web or contact the local tourist office to see if they offer that service. Danish Architecture Centre, for example, has made a series of interesting podwalks that you can download from their website.
Galleries and craftsmen also open to the public without charge, but many are only open in the summer months. If you are interested in architecture Denmark offers plenty of free experiences, and in recent years many new and interesting buildings have been erected throughout the country, in addition to the classic architecture to be found everywhere.