Style Units

From Tomb Raider Wiki

This is a small unlockable level in Anniversary which is gained by finding all of the secrets. It is mainly a 3D piece of art rather than a real level. There are no puzzles and no combat. Rather, the player gets to walk around and look at the area in which the game artists practiced texturing the different locations. There is one section for each location in the game with sample textures, including some textures that never made it into the main game (such as dolphins on the pool in Greece which was in the original Tomb Raider but did not actually appear in Anniversary).