Escalera Catacombs

 is a secret location featured only in the Red Dead Redemption Undead Nightmare DLC pack.

Background
During the storyline, John Marston must make his way down the catacombs fighting off the Undead and Mummies, all in order to return an Aztec Mask to its rightful place

Unfortunately Seth went to the Catacombs several months later. He takes the Aztec Mask, not foreseeing the consequences (however this may not be the case, as he seemed to be the only person to enjoy the undead overrunning the world): this makes the Undead rise again, also reviving John Marston, who was presumably killed by Edgar Ross preceding the events of Undead Nightmare.

Layout
The Catacombs weave and turn around underneath Escalera. They are notably of Aztec design, featuring large blocks of stone lining the walls and ancient runes covering them. Many different rooms and corridors feature the different Undead types. Also introduced in this area is a new enemy - Mummies - which fall from the walls while John ventures down. The further the player ventures into the Catacombs, the narrower the corridors become, eventually leading into a main room with four supporting pillars and an altar; presumably where the Aztec Mask once lay before being taken by Abraham Reyes.

Trivia

 * During the last Undead Nightmare mission, John is accompanied by a woman who is later revealed to be an ancient Aztec ghost.
 * The further down John descends into the catacombs, the more Aztec culture is revealed.
 * The Semi-auto Shotgun can be found in the catacombs.
 * Upon completing Undead Nightmare, if you return to the catacombs as the undead John Marston, the entrance will be boarded up and unavailable to be entered.

Catacumbas de Escalera