Gamla Stan literally translated to Old Town. Which is an area in Stockholm and is one of the oldest and best preserved medieval city centers. Founded around the 1250's, it feels like a step back in time when walking down the cobble streets. Anyway, this draws a lot of tourists and it is usually packed as it is picturesque and 'Instagrammable', but you have to get here early if you want to be away from the crowds. There are interesting restaurants in this area that are Viking themed, there is even one that serves a moose burger. Several interesting sites are nearby too, there is the Nobel museum that the carolers below are caroling on its steps. In addition, the Royal Palace is nearby where you can take a tour. It is very ornate but once you've seen one you've seen them all. My favorite site is the Stockholm Cathedral, it is beautiful, and there is a large statue of St. George. It is well worth a visit. On the subject of Vikings, you can walk on Prästagatan (Priest's St), where you can see a Viking Rune Stone that most likely predates city.
Now, Julmarknad is located in Stortorget, the oldest square in Stockholm. When I arrived it was packed and I was not able to enjoy myself since it was difficult to get a good look at some of the stalls. I did manage to take some photos for you to take a look but I will have to try and manage to get better ones. Perhaps by arriving as they open or as they are closing.
