This study seeks to fill a major gap in the fields of Nineteenth-Century American and British Studies by examining how nineteenth-century intellectuals shaped and re-shaped aesthetic traditions across the Atlantic Ocean. Special attention is paid to a group of salient cultural concepts, such as artist-as-hero, imagination, the picturesque, reform, simultaneity, and seriality. Although embedded in a particular aesthetic tradition, these concepts travel from one culture to another and are transformed along their transatlantic journeys. The purpose of this book is to explore the roles of these 'traveling concepts' within the realm of transatlantic cultures and to trace their at times surprising paths within ever-widening transnational intellectual networks.