This romantic treasure—a 19th-century manor once home to Dutch painter Ary Scheffer—is hidden away below exuberant Place Pigalle. The ground floor of the tiny museum mostly displays the belongings of poet George Sand, along with several of Scheffer’s own paintings. In the artist’s two spacious ateliers, you can now see rotating exhibitions from the Romantic period, and in the summer, the shady garden and its tea salon are a truly secret tip.