Cour d'Honneur at the Palais Royal
I think the courtyard at the Palais Royal, "Cour d'Honneur" is a prime example of what's great about Paris. There's the palace that was built in 1629, that now coexists with a 20th century sculptural installation, that contemporary families use as a skate park. So many spaces in Paris preserve the culture but acquire new and distinct layers of innovation, while retaining their usefulness to the public. Ancient and modern, grand and practical all at once. "The Cour d'Honneur" contains 280 black and white striped columns installed by Daniel Buren in 1986.