Make your way towards the closest wall and start going up. When you reach the top gallery, turn left and leap over a destroyed staircase.
Keep running; you'll have to use a horizontal beam to avoid falling. At the end of the platform, perform a longer leap while holding the action button. Lara will use the climbing axe, allowing you to reach a higher ledge where you'll have to press the action button again.
Leap over to an interactive edge, climb the beam and turn left. You need to jump to the crate pictured above and climb on top of it. Face another ledge and perform another jump.
Leap over to the next interactive ledge, then jump again. Press the action button as soon Lara is near the wall. Move right and leap over to the nearby ledge.
Keep moving right until you reach the second interactive rock. Be ready to press the action button again. Make your way to the top, jumping when needed (reward: 100 XP).