Small (as the tour guides explain in comparison to other palaces) but interesting. In response to the review who said it’s difficult to buy a tour ticket, that is false. The website is available in English, with details on the times of the tours in English and links to purchase tour tickets at Ticketmaster Norway. This is how I was able to purchase my ticket before I even got on a plane. True, some Norwegian websites are harder to pay with non-Norwegian credit cards, but this was not one of them in my experience of booking several things for my trip. If you are curious about the palace, Norwegian royalty, etc, then I recommend the tour. No photos are allowed and you must store your things in the provided lockers. I found all the staff and security to be friendly and helpful. Tip: if you purchase your ticket ahead of time (digital or print it) then you do not need to stand in line. Just be there at least 5 minutes before your tour so that you are there when the staff announces the tour time may come up if you have a ticket. The line you see is to purchase a ticket and it’s incredibly slow.