This open-air museum of public sculpture brings whimsy and delight to what would otherwise be a rather bleak set of steps between Calle Serrano and the busy Paseo de Castellana. The works represent two generations of the Spanish avant-garde (a dangerous thing to be in the Franco years) including Joan Miró and the so-called Generation of 1950, a defiant group of artists who picked up the mantle of abstraction. Our favorite is the waterfall/fountain of alternating wave forms (it’s called Barandillas en “S”) created in 1972 by Eusebio Sempere. You can’t miss it—the rushing water makes you think that Madrid has suddenly sprung a leak.