M87 is the biggest and in that sense perhaps the greatest galaxy of our sector of the universe. Our galaxy and thousands of others are part of a Virgo supercluster. M87 is at the heart of this galaxy supercluster.
Our galaxy is at the outer edge of the Virgo supercluster.
This image is one of Hubbles first and still one of it's greatest. There's still plenty of great pictures from Hubble though!