I wont write much about the Cathedral per-say as it's already well known. What I would like to mention is that this cathedral has a stupendous view from the it's Platform which is approx. 330 steps high: from here you can enjoy the magnificent view of the city. On a clear day, you can even see Vosges and Black Forrest from the top of this platform. There is also an Astronomical clock... this mechanical astronomical clock is an invention put together by various artists, mathematicians and technicians.