Where was Struggle for the Matterhorn filmed?

1928 film by Mario Bonnard, Nunzio Malasomma

Struggle for the Matterhorn (1928) was filmed in Berlin, Matterhorn, Zermatt, Monte Rosa Massif and Johannisthal, 5 places named in its Wikipedia article, in Germany, Switzerland, Italy. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data