Mt Olympus (on Mars)

The tallest mountain in the solar system, Olympus Mons on Mars.

It has a height of 25 km, Mount Everest is 'only' 8.8 km tall ...

Imagine it's a sense of awe a lot like visiting the grand canyon only many orders of magnitude greater. It will be a cool day for mankind when Mars is populated with its earliest permanent residents, and someone who likely isn't even born yet will be the first to scale Olympus Mons

Across our solar system, only four celestial bodies-Earth, lo, Triton and Enceladus-are thought to be volcanically active.

Several others, such as Venus and Mars, show evidence of volcanism in the past. Others still, like Pluto, are continuing to intrigue the planetary scientists that study them. Thanks to spacecraft like Magellan, Cassini, and New Horizons, we're able to take a close look at the fascinating features of planetary and lunar bodies near and far.

From Venus to Pluto, here's a ranking of the 5 coolest volcanoes in the solar system http://bit.ly/FuZyyL

If you were standing in the middle of the slope you'd barely perceive that you were on a mountain because it's so wide, and it would stretch to all horizons so there would just be a slight upward incline. But then you'd get to the crater in the middle, or to the sheer cliffs surrounding the whole thing (I think those alone are taller than Mount Everest, or they're pretty high anyway, especially on the western side in the foreground of this image), and you'd suddenly perceive it