Perform the Chimney Jump to reach the narrow ledge on the right.

Climb on the ledge and jump forward to grab the small handholds on the wall.

Climb up to reach the handhold above and traverse to the left around the corner.

Jump to grab the small handholds on the wall to the right. Climb down and to the right as much as you can. Then jump to grab the small handholds on the next wall and climb upwards and to the right.

When you reach the top, jump to grab the rounded pillar on the right. Climb almost to the top (do not perch on the pillar) and jump to the stone ledge ahead. Pick up the Treasure (37/50) and jump back to grab the pillar.

Perch on it and jump to grab the next pillar, then the third one. Slide down a bit and jump to perch on the fourth pillar.

Jump to grab the narrow ledge that goes around the square pillar ahead. Traverse to the right around the two corners and pull up.

Jump up to grab the horizontal pole with the hooked end and traverse to the other side. Lara grabs the other pole automatically, so keep traversing until you reach the next square pillar. Release to grab the narrow ledge below...

... and traverse to the right around the corner. Pull up and jump to the stone beam ahead.

From there, jump to the doorway.