A pro-Republican propaganda documentary made during the Spanish Civil War. It reports on the demonstration held in Barcelona on December 27, 1937 to commemorate the capture of Teruel by the Republican forces.

Produced for the National Federation of Building Workers Ciné-Liberté, a Popular Front organization intended to counteract capitalist interests in the film industry, Epstein’s union documentary examines building policy from the perspective of ordinary workers and notable architects. In addition to touring the Cathedral of Chartres and the Paris Exposition of 1937, the film features rare interviews with Le Corbusier (at his drawing board, no less) and Auguste Perret.