This book presents the extraordinary aspects of the France-United States Memorial Hospital in Saint-Lô, designed by the Franco-American architect Paul Nelson. Born from the total destruction of the city during the Second World War, it combines a cultural and humanist approach with a wealth of architectural, spatial, structural, and technical innovations. Paul Nelson envisioned a new hospital "for life." Visitors from all over the world flocked to discover this revolutionary institution where everything was designed with the patients' well-being in mind, notably the use of color in the building and its furnishings. The United States provided substantial support for its construction, which became a symbol of the rebirth of a Europe traumatized by the war. Donato Severo highlights the highly innovative nature of Nelson's approach to this building, which remains one of the most representative examples of the functionalism and technological optimism of French architecture during the post-war Reconstruction period. Nelson's deep desire was to bring maximum well-being to patients, so he called upon many artists and designers: Vladimir Bodiansky for the structure of the building, Jean Prouvé for the ovoid surgical rooms, André Salomon and Jean Dourgnon for the lighting, Charlotte Perriand for the furniture and above all Fernand Léger for the polychromy and the integration of works of art, undoubtedly one of the most extraordinary characteristics of the building.