La Samaritaine, a historic Parisian department store that towers over the banks of the Seine, spent the last 16 years undergoing an extensive renovation to its art deco building, first built in 1869 and reconstructed in 1930, and the surrounding neighborhood. It reemerged last month as a contemporary campus for top-tier French food, shopping, and culture, anchored by the five-star Cheval Blanc Paris hotel. Inside, the Dior Spa Cheval Blanc—a collaboration between the hotel chain and the French fashion house—promises “happiness in the heart of Paris,” a tall order somehow made attainable through its distinctive blend of wellness treatments and considered design, the latter created by architect Peter Marino. The spa’s director, Sophie Levy Kraemer, and her team spent five years developing a robust array of remedies that combine manual procedures, state-of-the-art technology, and Dior skin-care products. She also worked closely with Marino on the interior, including its textures, colors, furniture, and fixtures. The result is a one-of-a-kind multisensory retreat for the body and mind.