Paris' most visited mosque is a beautiful green and white tiled structure, located right across the street form the Jardin des Plantes. The quiet courtyard is the perfect place for an afternoon of mint tea and pastries, and the restaurant inside is open for lunch and dinner.
One of the best parts of a visit to the mosque, however, is the hammam. The public baths are open three days a week for women and one day per week for men. Choose your favorite room -- there's hot, hotter, and hottest -- and take advantage of a gommage, an invigorating exfoliation treatment. The interior is mellow and welcoming, with stained glass and marble columns. Avoid a Saturday visit, as it can get rather chaotic. A perfect way to pass a weekday afternoon.