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The Lost City is a visual look-development level that was developed during the production of Halo 3. The level was based around a Forerunner city and was described as being so immense that ""it could be a game in itself".
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The Medical Troop Warthog is a Warthog type included in the files of Halo 3 but is inaccessible during gameplay. It's appearance is that of a Troop Warthog, but with two benches being replaced with stretchers.
The G4H-DuSH Rocket Launcher was a weapon that was created in concept art as a new type of rocket launcher.
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The Guardian Forest was a level that was concepted and had several plot elements and an enemy designed for it.