To all sifu..

Im new and just started to play AC.. Nice game! But i have 2 question here.. hope anyone here can advise..

1. In the Masyaf. Inside the library staircase there has a gate and 2 guards standing there. Do the gate can be open and go out? Coz from inside can see a garden out there.

2. Outside the library building can see up there alots of guard. How to climb up there? Is tht possible go up there? How?

Thanks in advance..