This project transforms Newark Castle into a serene retreat, blending historical preservation with sustainable, modern design. Focused on hydrotherapy, it features balneary spaces using harvested rainwater and purified River Trent water. Activities like walking, swimming, painting, and meditation support mental well-being. The original castle walls are repurposed to enclose new spaces, creating a safe, peaceful atmosphere. Guided by biophilic design, sustainable water management, and hydrotherapy, the project brings nature into architecture while promoting relaxation and recovery. It aspires to be a mindful sanctuary, honoring the past and offering a sustainable, health-focused escape for individuals and the wider community.