Sergels Torg is the central square in Stockholm today. It is quite old but is located in the heart of the City. Here you will find among other things, an important road junction on which you can converge to the Sveavägen and other famous streets of downtown.
The square is characterized by the presence of a large fountain in crystal whose water reaches as high as just over 37 meters. It is the work of Edvin Öhström who had it built in 1974. The work is famous because it was built on two levels. The two levels consist of the upper one with a fountain and the bottom one where you will find the metro station, shops and some supermarkets.
The square was built in the sixties after the demolition of old buildings that occurred in the previous decade. If you go to this place in winter you may encounter the ice rinks which are setup every year and are the most important and beautiful in the city.
While nearby it would be wise to also look into: Three awesome things to do in Stockholm.