""I am deeply impressed with what I have seen and I must say that vivid memories of what happened 60 years ago are part of the European history," the Croatian official wrote in the book.
Horrendous crimes which were committed remain a lasting symbol of intolerance and hatred as well as of tragic consequences of the fascist and Nazi ideology, he also wrote.
The Monument and the centre commemorating European Jews killed during the Second World War was opened in May 2005. The monument and the centre, worth 18 million euros, are on the Potsdammer Platz.
On Tuesday afternoon, Seks is due to meet his host, Bundestag Speaker, Norbert Lammert.