The Portals of Iron Mountain are time portals in a chamber in Gary, Indiana, each opening onto a year of Terra. Whoever controls them controls the door to any of those eras.
| Type | Place |
| Spanish entry | Portales de Iron Mountain (Mundo Nuevo) |
- 1987 — the present (Gary, Indiana).
- 1494 — Mr. Wolf went there; era of the Libertateurs and the Invisible Cities.
- 1887 — when the platforms began; near the Deep Ones (1888) and the Regulators.
- 1300 — the Templars; Florenzen.
- 363 — the “future” of ancient Terra; possibly late Rome.
- 2087 — post-apocalyptic future, if Graz’zt was not stopped.
- 1788 — “the era of the Liberators” (Les Libertateurs).
Each portal holds “bombs sealed in gems,” which five key-stones can disarm.