I found a little trail by the Schlossmuseum which led me to the below view of the Donau river.
On this little trail, there was also a statue of Johannes Kepler. He was a 17th century German mathematician, astronomer, and astrologer. There is a university in Linz named after him.
What I really like about Linz, is finding unique art on the side of buildings.
Linz may be an industrial city, but sometimes it can be rather beautiful.