Hermes' Shrine

It a shrine dedicated to Hermes in Tartarus. It is located in a sheltered depression like a moon crater. It is a ring broken black marble columns surrounding a dark stone altar. It also serves as a path of communication between Tartarus and Camp Half-Blood.

The House Of Hades
While roaming in Tartarus, Iapetus takes Percy and Annabeth to the place where the shrine was located.