Rudolf Klein-Rogge, Fritz Lang (upper right), & crew on the set of  Metropolis (1927, Fritz Lang) (via)

Sylvia Sidney & Henry Fonda in You Only Live Once (1937, dir. Fritz Lang) (via)

Brigitte Helm in Metropolis (1927, Fritz Lang) (via)

Rudolf Klein-Rogge & Brigitte Helm in Metropolis (1927, Fritz Lang) (via)

M (1931, dir. Fritz Lang) (via)

Paul Richter slays the dragon in Die Nibelungen (1924, dir. Fritz Lang) (via) 

Above: Model for the dragon in Die Nibelungen (1924, dir. Fritz Lang) by set designer Erich Kettelhut; below, Paul Richter & Lang on the set of Die Nibelungen.

You can see the dragon in action here.

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Brigitte Helm in Metropolis (1927, Fritz Lang) (via)

Brigitte Helm, Fritz Lang, Heinrich George and assorted cast & crew on the set of Metropolis (1927, dir. Fritz Lang) Photographer: Horst von Harbou (via)

Metropolis (1927, dir. Fritz Lang)

Joan Bennett in publicity still for Scarlet Street (1945, dir. Fritz Lang) (via)

1-3: Fritz Lang (right) directs Peter Lorre (left) on the set of M (1931), 4: Production sketch by M art director Emil Hasler

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M (1931, dir. Fritz Lang) (via)

You Only Live Once (1937, dir. Fritz Lang) (via)