RELIC 1

The first relic is near the Greek Fire Depot Base Camp. Enter the the room in the northeast corner and scale the rough climbing wall to reach the hallway above. Head to the right, jumping across two concealed spike pits. You'll find the relic in the northeast corner. See the map, walkthrough, and/or this short video for details. (Click screenshot to enlarge.)

DOCUMENT 1

The first document is found just after you drop down through the bell tower following the confrontation with Ana. To retrieve it later, return to the Chamber of Records Base Camp and squeeze through the crack in the wall to the south. The document is ahead on the right as you enter the tower. (Click screenshot to enlarge.)

DOCUMENT 3

This document is on the balcony on the north side of the Atlas room. To get back there later in the game, fast travel to the Chamber of Records Base Camp and follow the passageway to the north. Use the grapple to swing across the chandeliers to reach the document. The map and walkthrough have details. To get back, scramble up onto the wall in the southeast corner (screenshot) and retrace your route to base camp. (Click screenshot to enlarge.)

DOCUMENT 5

This document is sitting on a crate in front of the building in the southwest corner of the Greek Fire Depot. If you missed it, return to that camp, follow the front of the buildings along the south side of the pool, swim across the stream, and then climb the stairs to reach the document. Or pick it up when you return for the last mural, below. (Click screenshot to enlarge.)

MURAL 2

The second mural is near the end of the level, just before the tunnel leading to the exit. If you missed it the first time through, return to the Ridgeline Base Camp in the GEOTHERMAL VALLEY. Then follow the path to the southeast to get back to the tunnel entrance. Drop down inside and follow the tunnel. The mural will be at the top of the stairs on the right. The walkthrough for the third mural includes more screenshots. (Click screenshot to enlarge.)

EXPLORER SATCHEL

The satchel is sitting on the the balcony in the northwest corner of the area with the pool and the huge statue. If you missed it the first time, return to the Greek Fire Depot Base Camp and climb up to the balcony through the room in the northeast corner. See the map, walkthrough, and/or this short video for details. You can find the survival caches without first finding the Explorer Satchel, but doing so will reveal the caches on your in-game map. (Click screenshot to enlarge.)

SURVIVAL CACHE 2

The next cache is at the top of the stairs just southeast of the Greek Fire Depot Base Camp.  (Click screenshot to enlarge.)

MONOLITH

The monolith is on the upper balcony on the northeast side of the Greek Fire Depot area. To get there, climb up through the room in the northeast corner, work your way around to the upper level northwest, then back across the front of the building to the northeast. See the map, walkthrough, and/or this short video for details. (Click screenshot to enlarge.)

COIN CACHE 2

This cache is back near the start of the level. To find it, fast travel to the Chamber of Records Base Camp and squeeze through the crack in the wall to the south. The cache is just ahead, between the left wall and a dead body. (Click screenshot to enlarge.)

STRONGBOX

The only strongbox in this level is in the passageway leading to the exit. If you missed it the first time, return to the Ridgeline Base Camp in the GEOTHERMAL VALLEY. Then follow the path to the southeast to get back to the tunnel entrance. Drop down into the tunnel and continue forward. The strongbox is at the top of the stairs on the left. The walkthrough for the third mural includes more screenshots. (Click screenshot to enlarge.)