Fernweh = Wanderlust. Wanderlust may reflect an intense urge for self-development by experiencing the unknown, getting to know unfamiliar cultures, way ways of life and behaviours or my driven by the desire to escape and leve behind depressive feelings of gullt, and has been linked to bipolar disorder in the periodicity of the attacks. Among tourists, sociologists distinguish sunlust from wanderlust as motivating forces (Wikipedia)