Asteroid Montage
It may surprise you to learn just how many places our robotic spacecraft have visited over the years.
This image is a montage of all small (non-planetary) bodies that have been visited so far – five comets and eleven asteroids (although two of those asteroids form a double asteroid system). With thanks to Emily Lakdawalla from the Planetary Society for collecting the images, resizing them all to the same scale and composing this impressive image. I just wish it was available as a poster!