Madison Square Park is a small but handsome green space at the meeting point of Flatiron, NoMad, and Midtown South. The park gives some of the best street-level views of the Flatiron Building, the Metropolitan Life Clock Tower, and the Empire State Building rising farther north.
It is more of a pause on a walking route than a destination for a full afternoon. Come through when exploring Broadway, Union Square, or the Flatiron District, and linger if the public art or people-watching is good.