The Mongol Rally Un-Route
A rally that spans 75% of the worlds largest land mass is going to take in some pretty impressive scenery and while we're not about to tell you what you should see like some kind of namby-pamby coach tour, there's no harm in pointing out some highlights. So with no further ado here is a not particularly exhaustive list of highpoints of the un-route.
Nurburgring
The Nordschleife or Nürburgring to you and me is where they have the German Grand Prix, what makes it interesting to Ralliers though it the fact that it is a public toll road, which means for the paltry sum of €26 you can go around it, and because most of it is a de-restricted highway you can go as fast as you like. Which for most of you will be about 70mph.
Transfagarian Highway
A certain Mr Jeremy Clarkson famously declared this the best road in the world. By the time you've finished the Rally you're bound to think of a couple that are better, but this remains a pretty good benchmark, there is also nearby the equally good Transalpina highway.
Chernobyl 
You might want a reminder of the devastating power of a ruddy great nuclear disaster and there are few places better. Try to find the two headed dogs and get chased by the 15ft cockroaches, just be sure to leave when you start to get headaches.
Cappadocia
The Turkish site of Cappadocia is home to a group of Turks who have chosen to live in these pre-historic homes to escape the prohbitive utility bills and council tax of their region. You can also stop for a balloon ride and pretend to be a giant looking down on the little ant-people.
The Aral sea fishing boats

The Aral Sea was significantly bigger 25 years ago, unfortunately this now means these fishing boats now sit a bloody long way from the shore. Hence the delapidated state. Why not check out the eerie beauty of them yourself. The giftshop also sell tasteful scale replica 'Aral Sea Fishing Boats'. Probably.
The Gates of Hell

The Gates of Hell were made when a furious Satan came up from the underworld to destroy mankind, fortunately he slipped on a melon-skin and fell back to whence he came. This didn't actually happen but hopefully you read the above bit about us not being a coach tour and aren't too upset. You can look up online what the crater is, or just come and get your photo taken on the edge, maybe even toast marshmellows?
Baikonur Cosmodrome
Although they don't usually let you into the cosmodrome without hefty fees and a lot of advance warning, there is a cafe not too far away where you can sit and have a nice cuppa and bite to eat while watching rockets launch, launches are pretty frequent so there will undoubtably be one while you're nearby.
The Altai Mountains
Another beautiful bit of driving; but what do you expect? This is the Mongol Rally after all. Don't take our word for how good this road is though, check out this video.
The best view of the stars you've ever had
Not just all that though, there are lots of bits we're going to leave to your imagination, the Pamir Highway, the other mountains, deserts, seas, flora, fauna, bars, nightclubs. Not to mention a giant fucking slice of the unknown to spice it all up a bit. Too much to cram into a four week trip, a ruddy good challenge to try anyway.