 1996 Metzler has exhibited in the Baths of Caracalla, in 1997 in Sienna and in 2003 in Milan.In 2006, a selection of his works at the Park Hotel on the Bürgenstock was seen at Lake Lucerne too.In the same year he participated in the 3rd Swiss Sculpture Triennale in Bad Ragaz and Vaduz, for which he was the technical director, and where he also took part in the first 2 shows.