one of the oblivion gates had a huge mountain with a sigil keep at the top, and it was quite fun to climb unlike the jerall's which were just a big slope... these were craggy and had many routes up.
I really wanna climb that big svckah in the trailer by finding my own random path up and not be restricted to trails. it looks frickin HUGE!!!!!!!!!
http://zapp5.staticworld.net/news/graphics/220584-skyrim_original.jpg