A black hole is a spherical singularity in the space / time continuum, therefore its "edge" should be vible from all directions. The more intriguing question is : If the black hole singularity is self contained to an external observer where does the mass it absorbs end up ???? A puzzle that remains - it has been postulated that such are the beginnings of the so called worm holes connecting different regions of our universe. A convenience that keeps science fiction movie plots within the life expectancy of an earthbound humanoid audience  .-)