1. RELIC - "BONE ARROWHEAD" - Mongolian Invasion
Look at the Arrow Head to uncover the Secret.
It is on the left side of the pool Lara has to dive through.
2. RELIC - "PAIZA" - Mongolian Invasion
Dive to the first Section. There is another Cave to the right. Dive through to it, the Relic is there.
The Secret is at the back of the Relic.
3. RELIC - "ENAMEL BROOCH" - Tokens of Faith
The Relic is at the foot end of the Zip Line when getting out of the ICE TOMB.
Turn it around and zoom in to uncover the secret.