7. Master Chief Building
https://www.youtube.com/watch?v=MCYiW4mNpQ0 Bungie have been surprisingly restrained when it comes to referencing their most famous and popular franchise, but that's not to say they haven't hidden away a few little titbits. One of the most blatant is this building, which bears more than a passing resemblance to the one and only Master Chief. To find this easter egg, first venture to the planet Mars. Once you've landed on its red, dusty surface, journey over to the Trenchworks area. There, you'll find this large outpost building, unlike any other featured in the game elsewhere. The glowing golden window and green banner, along with the distinctive shape of the 'visor', resemble the Chief about as much as a building possibly can.