I can think of three things you might be talking about:
The squeeze problem - the boulder squeeze problem at the base of the bard buttress and tiger wall along the road. Not that hard to find.
Scorpion crack - also not that hard to find, look at bluff major from the squeeze problem. It's the fist crack splitting bluff major in two.
Mr Chicken - the squeeze problem that goes behind the watchtower. I can't remember what's on the watchtower crack side but there is a big roadsign on the watchtower chimney side. Climb watchtower chimney and head right at the sign - you'll eventually come out at watchtower crack...or maybe you wont