The "ugly concrete structure" is a shopping mall, car park and condo in one. It is called "Columbus-Center" and it *is* ugly. Other interesting sights are the German Naval Museum, which has not only exhibits of the German Navies but of civilian ships dating back to the vikings. The Little Seaside Zoo is cool, too. My favourite is the German emmigration Museum, though. Retrace the steps of emigrants from germany in a very realistic and nicely done museum.
For a live Webcam go here:
http://www.wsa-bremerhaven.de/webcam/index.html
(Nordwest Webcam is the one to choose)
You can see the Maritime museum in the front left, a sail ship of which I forgot the name, but it has a niiiice restaurant onboard. I recommend the Labskaus, if you have a strong stomach. On the right is the said concrete structure. In the background middle is the emmigration museum, left at the red-white tower is the zoo. The Type 21 is on the right side pier, behind the sail ships masts.