Toss a rock in there and let's see if we hear it hit bottom.

What would you see if you went right up to a black hole? Featured is a computer generated image highlighting how strange things would look. The black hole has such strong gravity that light is noticeably bent towards it - causing some very unusual visual distortions. Every star in the normal frame has at least two bright images - one on each side of theblack hole. Near the black hole, you can see the whole sky - light from every direction is bent around and comes back to you.

Via APOD