Rich with Denmark's history and culture, you may want to reserve a large amount of time to visit this, perhaps as much as a half day. Even then you will not get to see everything inside. Be it either for the person wanting a taste of Denmark or someone yearning for a detailed understanding, you will find yourself with several large exhibits detailing how Denmark came to being.
From prehistoric times to the present, you will have the opportunity to see tools from the Bronze Age, early Christian era rune stones, and preserved rooms from the Renaissance Era. You can also learn about Denmark today. The exhibits detail the wars between Denmark and Sweden, as well as more recent wars with Germany over the previous two centuries.
For those seeking more exotic exhibits, there are good Egyptian and Asian permanent exhibits.
This large museum contains four floors, and you are advised to concentrate your efforts only on certain exhibits.
If you want to know the history of Denmark and especially Copenhagen, then all the answers to yours question can be found if u will visit National Museum. It is Denmark's largest Cultural and Historical Museum. It has been built in a royal 17th century mansion.
The National Museum contains all things Danish, with an excellent display of prehistoric Denmark and Viking age artifacts.
To be honest, I didn't particularly find Copenhagen's National Museum to be all that impressive, but, I did like this bull that I took a picture of.