All Hallows

From Tomb Raider Wiki

All Hallows is a bonus level in Tomb Raider III, which is unlocked if the player finds at least 59 secrets in the game (out of a total 60).

The level takes place in and around a church in London, England. The level as it stands now has no connection with the rest of the game, though it is rumoured that it was originally meant to be included in the game as the level following Thames Wharf.