In a synagogue in Germany that was destroyed in 1938. Interesting, since we are today reliving 1938. From [1] AP, with thanks to Mrs. Obelix:

COLOGNE, Germany - Pope Benedict XVI warned Friday of rising anti-Semitism and hostility to foreigners during a visit to a synagogue that was rebuilt after being destroyed during the Nazis' infamous Kristallnacht pogrom in 1938.

Benedict became only the second pope to visit a synagogue, praying and remembering Holocaust victims with Cologne's Jewish community — Germany's oldest.

"Today, sadly, we are witnessing the rise of new signs of anti-Semitism and various forms of a general hostility toward foreigners," he said.

Yes, and those foreigners in Europe are the foremost purveyors of this new anti-Semitism. It would have been good for the Pope to have addressed that.