Ancient Tombs are special locations in Just Cause 3. They are easily recognized by the blue flowers growing on top of them. They are all hidden around Insula Striate. Visiting all of them and paying respects will unlock a special weapon in Rebel Drops – the Urga Stupka 210 mortar launcher. It will also give you the Tomb Raider achievement. This guide will show you all Ancient Tomb locations in JC3.