Wind blown rock, coral, pointy windblown rock, another water park.
Yes you don't get those precise things anywhere else, but they are not worth £2K, in fact I was bored just googling them. Anyway Petra has the windblown rock thing nailed.
I've zero interest in South America but I can imagine it must be epic, Aus just isn't, even the (9ish?) people I've met who live there all want to leave because they are bored.
I was talking about Central Africa, sorry I didn't make that clear. So that's pretty much the ruins at Zimbabwe.
@Fox.
Africa is just another holiday. Fly in, organise a weeks walking safari, book a lodge and watch the watering hole. It is pretty much like what you saw on Top Gear, except there are more flies in Scotland.
It is definitely worth £2K, although if I were the OP I'd still do the Interail thing first because it's easier to slum it when you are young.