The German president, Joachim Gauck, visited the former WWII ghetto and concentration camp at Terezín in central Bohemia on Tuesday afternoon. He was accompanied by his Czech counterpart, Milos Zeman, who said Mr. Gauck’s visit followed logically from his 2012 visit to Lidice. The German head of state viewed the small fortress at Terezín, which the Prague Gestapo used as a prison. Around 155,000 people, almost all of the Jewish, passed through Terezín in the course of the war; nearly 120,000 died, around 35,000 of them at Terezín itself. Prague’s Rabbi Karel Sidon, who brought Tuesday’s memorial ceremony to a close, said he regarded Mr. Gauck’s visit not as a mere gesture but an expression of interest. The German head of state is on a three-day state visit to the Czech Republic.