Pull the cage outisde through the gate.
Position it near the large pole between the huts.
Now use the cage to jump on the pole.
Climb to the top and then do a jump to the ledge nearby. Kill the bats that come.
Swing across using the thin pole.
Use the grapple to get across the other side.
Use the ledges to get to the left side.
One final pole and you're there.
Enjoy the artifact #1.
And of course enjoy the view.