Most fascinating non-Earth planet in solar system IYO

Venus is pretty hardcore with the boiling acid atmosphere made out of metals and absurd pressures.

Though I guess both Jupiter and Saturn have it beat in those regards, considering nobody even knows what the hell is at the center of them :D

@gamerguru100: which solary system?

If ours, I'll have to say Mars is the most interesting primarily because we are more likely to inhabit it before any other planet.

If any random solar system then, Gliese 832 c. I hope to live long enough to see at least shed some light as to the contents of that planet lol. It looks soooo similar to ours.