I've gotten about half way through Tomb Raider so far I've only managed to find 4 hidden tombs. I want to raid all of these tombs because they each have a ton of scrap and experience in them (Not to mention that they have treasure maps that tell you were other hidden items are in the area) but I'm sure I've missed a few. Anyone figure out where they all are yet?
Alright, without knowing for sure how detailed of an answer you're seeking, I'm going to list the tombs by location, along with their map coordinates. Excluding DLC, there are 7 optional tombs, and they are:
Each tomb will contain either a complete, or partial, treasure map for its respective zone. It will also occasionally contain a part for upgrading one of your weapons. There's no super bonus for completing all 7 of them other than the Intellectually Superior achievement/trophy.
You can check out an interactive version of the map online to see the location for each of the above more visually. You can filter based on markers to see the tomb entrances.