* Life and Work of Honoré de Balzac: Biography of the prolific French novelist Honoré de Balzac, widely regarded as one of the greatest writers of the 19th century. Explores Balzac's life, influences, and writing process, as well as the themes and characters in his works.
* The Rise and Fall of the French Empire: A historical account of the French Empire, which spanned several centuries and reached its peak in the 19th century. Examines how the empire was established and maintained, the challenges it faced, and the factors that led to its decline and eventual collapse.
* The History of Paris: A comprehensive and richly illustrated history of the city of Paris from its origins as a small settlement to its development into one of the world's most renowned cities. Traces the city's evolution, architecture, and cultural heritage, as well as its political, social, and economic changes.
* The Art and Architecture of the Renaissance: An exploration of the Renaissance period, known for its significant artistic and architectural achievements. Capel examines the major artists, architects, and works of art of the period, their influences and innovations, and their impact on subsequent artistic movements.
These are just a few examples of the works written by Gerard Capel, who has contributed to multiple genres and subjects, including history, literature, and art.