Gabriel Knight III: Blood of the Sacred, Blood of the Damned (1999) features striking similarities to The Da Vinci Code, including themes of holy blood, Jesus's lineage, and secret societies. Both works involve solving mysteries related to religious conspiracies. Phantasmagoria and Age of Empires are unrelated to this theme, and while Gabriel Knight: Sins of the Father is part of the same series, it doesn't share these specific plot elements.