Jardin du Palais Royal by extrajoce
The jardin du Palais Royal is often overlooked by tourists as it is between the busy Opera (itself not far from the big department stores) and the musee du Louvre. It is a delightful and peaceful garden, which I find very typical of the Parisian elitism. The Ministry of Culture has a view on the famous colonnes de Buren.
Overall, it has a classic architecture, but I love the arcades, old shops, benches, gardens, and the quiet in the heart of the city.
Metro Palais Royal - Louvre, or Pyramides and 200m walk.