In the practice level you can get outside of Lara's front gate. Simply go to the last obstacle (the rope slide), walk to the edge with the rope slide and side step right all the way you can. After this you must turn about an 1/8 of a turn towards the wall. Now jump in the air, without pushing any direction buttons, while in the air press the look button and forward, and let go before landing. Repeat this process a few more times and by about the third jump you should be on top of the tower and able to jump onto Lara's outside wall. From here you can get outside of Lara's front gate or even get a view of her hedge maze, from above.
Submitted by: Michael