In the late 1960s, Horton’s mother came to own a pied-à-terre in the nearby medieval village of Roquebrune. Ricardo Labougle The view of the trilevel garden overlooking the Mediterranean from designer John-Mark Horton’s home on the French Riviera. When in Roquebrune, Horton’s mother would call on her friends Raymond Poteau and Henry Clarke. While Horton’s mother lunched with Poteau and Clarke, the boy would play in the garden. Tour the Gorgeous Gardens of This French Riviera House Open GalleryThe garden, a series of descending terraces, is “a mix of French and Italian,” says Horton.