After long hours at Reina Sofia museum time for going to Outer Space. It's called NuBel and it makes you wonderfully dizzy. Or, better, go there just before the museum - drink some wine and go to admire Guernica in 3D.
Secret cocktail bar set in a 17th century library. From the outside, it looks like an old charming bonsai shop. You can only access with reservation. To make the experience even more exclusive, visitors must enter a secret code in a small and discreet door.