Citadel
From Halopedia, the Halo wiki
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Citadel is an upcoming Halo 3 map that will be shipped in Fall 2009 with Halo 3: ODST. The Shotgun Spree achievement is attainable on this map. It is possible that this map is located in a Forerunner Citadel, similar to the one seen on The Covenant.
