3. Johnny Hartman Square 0.02 Acres

Johnny Hartman Square is a 0.02 acres sliver on a Flatiron-shaped island in Hamilton Heights at the intersection of Amsterdam Avenue, Hamilton Place and 143rd Street. Hartman was a World War II veteran and a celebrated jazz singer who recorded with Dizzy Gillespie, Errol Garner, and John Coltrane, with whom he recorded eight albums. Originally called Hamilton Square, for Alexander Hamilton, whose relocated home Hamilton Grange is just a few blocks away, the square was renamed Johnny Hartman Square in 1984.