This historic centre of Zürich is known as Altstadt, or "old town". It lies at the tip of the Lake and is split in two by the River Limmat. The right bank is referred to as Rathaus, after the City Hall building, while the left bank is Lindenhof. The latter is the site of the oldest settlement from pre-Roman times and it is also where the Roman castrum once stood. The whole of Altstadt is very charming, with Mediaeval, Gothic and Germanic architecture is interspersed along narrow winding alleys paved with cobblestones.