If you go on Nexus Mods (a popular modding site for most PC games) and search "TARDIS", you would see that most of the mods that add functioning TARDISes are for bethesda games. So I thought to honor those mods by bringing a bit of Skyrim to Doctor Who for once, rather than the other way around, and who better to invent a TARDIS in the world of the Elder Scrolls series than the mysterious, long dead(?), highly advanced civilization known as the Dwemer? 

The design I came up with is mostly inspired by the architecture of the northern dwemer clans, though I imagine that an accompanying interior would incorporate  more of the eastern style of morrowind (just move on if you don't understand the nerd stuff, please).

Front: 

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Sides:

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Still don't know what to call this besides isometric view: 

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Front with open doors: 

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Bonus picture: a recreation of the skyrim loading screen, made with photoshopped minecraft screenshots: 

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(Fun fact: this is actually a GIF that accurately shows the average length of skyrim's loading screens)

The identifying item would probably be chiseled stone bricks.