The graphic below shows the known planets of the Solar System and their main satellites (radius > 500km). Their sizes are proportional, except for the smallest objects (r ~ 500 km).
Source : NASA
Hi-resolution images from NASA were projected on the globes below. The places where landers or probes have reached the surface (by landing or crashing...) are represented by dots.
The globes can be rotated by dragging them.
Sources : NASA for landing coordinates, and for the maps of Venus, Mars, and the Moon.