The N Seoul Tower is located south of the city hall area. it is difficuly to grt to As it is on a hill in a large park . you can take a sky tram to the tower area. There is a fee for the sky tram . There is a fee to go up the tower. There is a restaurant at the top. They recently cleaned the windows so the views are clear at the time of this writing . i suggest you go about 45 minutes before sunset to get the best photos. It will get crowded at sunset time so another reasonto arrive a bit early