U995, at the Laboe Naval Memorial is about six miles northeast of Kiel.
If I recall the story, it was turned over to the Norwegian Navy after the war. When it was being decommissioned in the early 1960s the organization of surviving Kriegsmariner (U-boat veterans) petitioned the West German government to acquire it for a war memorial. When the government balked, the U-boat veterans pooled their own resources and bought it themselves.
A fitting choice, since the type VII U-boats (and the type VIIC in particular) were the most prolific of all U-boats.