The Citadel is an unmarked location in Horizon Zero Dawn. It serves as the royal palace for the Shadow Carja ruling party. The Citadel is a large sandstone palace, largely carved from the canyon walls surrounding the Shadow Carja settlement of Sunfall. The design is typical of Carja architecture, being comprised of copper and sandstone, albeit less ornate than what can be seen in Meridian. Aloy's access to the interior of the Citadel is limited to the throne room and the hallway leading to it: h
Shadow Carja, Horizon Wiki
Blackened Citadel
when you insist that the citadel is above the waterline. : r/WorldOfWarships
Citadel - Star Citizen Wiki
Traitor's Bounty, Horizon Wiki
The Edgelands - Granblue Fantasy Wiki
Priority: Horizon - Mass Effect 3 Guide - IGN
N'Erud Remnant 2 Wiki
Horizon helmet - Star Citizen Wiki
Timeless Horizon