The medina is the main attraction in Tetouan, as it is quite large, in full use, and a great number of its houses in very good condition. There is really no need to watch out for typical sights instead you should just walk slowly through its streets, and watch life around you, the changes in architecture and the sharp colours of house details or a parasol that brakes the dominant white.
Just some few years ago, walks in the medina could be a problematic affair, as Tetouan's unofficial guides had developed a culture of pestering tourist who just came to Morocco for the first time (coming from Spain with ferry). This is gone now, but still you might like to hire an official guide, to unfold the history collected between houses and behind walls.
There are more than 50 mosques in the medina, few remotely spectacular. Most noteworthy is the one that is also the largest, the Grand Mosque.
What could have been a great attraction in the medina is closed, the mazmora or underground quarters for Christian slaves. At the most thousands lived here. The mazmora contained a well, a chapel and an oratory.