The history of the old city can be traced back to the 13th century. The city has medieval alleys, boulder streets and ancient buildings, which are deeply influenced by the North Germanic style. In addition to Stockholm Cathedral, Nobel Museum and Knight's Church, the city is also the place where the palace is located. After the Three Crowns Palace was burned in the fire, the palace was built here in the 18th century. We mainly went to the square around the palace and the Nobel Museum. In front of the Nobel Museum, there is an ancient well in the central square of the old city. Hundreds of years ago, it was the only well in this area for residents to drink. Nobel grew up drinking the spring water flowing from this well. I didn't do this before I went, so I didn't drink a few drops of water from the old well water pipe, which was touched with some spirit. It's a pity.