Fifth Avenue is where New York decided to be grand, and the stretch from the library to the park is the proof — three quarters of a mile of limestone, gold leaf and plate glass, walked uphill in the literal sense and the social one. Start between the library lions and finish where the avenue spills into Central Park.
North from the New York Public Library, Fifth stops being a numbered street and becomes the avenue: the flagship windows, the diamond block, the glass cube up ahead. Turn in at Rockefeller Center — the Channel Gardens pull you down to the sunken plaza, the gilded Prometheus and the flags, with 30 Rock standing over it and the Top of the Rock deck looking back at the Empire State. Across the avenue, St Patrick's holds its white-marble Gothic against the towers; step inside for the hush.
A half-block detour on 53rd brings you to the edge of MoMA — the sculpture garden is the courtyard to borrow ten minutes from. Then the last gilded blocks deliver you to Grand Army Plaza: the Sherman statue, the fountain, the Plaza, and Central Park opening up. The N/R/W at 59th takes you on.

