4. A4 Pizza Bar
Late night pizza could go one of two ways. You could wade through wasted college bros in line somewhere downtown, or slide through the recently opened A4 Pizza Bar in Union Square for a taste of their award-winning pies, served cold by the slice nightly (with a side of Atari games on their vintage emulator).
Mon-Sat 5p-11p. 445 Somerville Ave., Union Square (617-764-4190)