From Hobbiton to Tatooine: Earth Sheltered Homes Make Sense All Over The Universe

Matmata, Tunisia (and the Lars House on Tatooine)

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Berber House

credit: Wikipedia

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Unlike the Irish and the Icelanders who wanted to keep warm, the Berbers of Tunisia built earth-sheltered houses to keep cool. The thermal mass of the buildings would absorb heat during the day and release it at night, moderating temperature to keep it comfortable all day long.

It should look familiar to Star Wars fans; this building was the Lars homestead on Tatooine; see it in Wookiepedia.