Ever heard of a Tulou? They are from China, meaning earthen building. The outer walls were made of rammed earth, a technique not conventionally though of as long lasting. That being said, these structures date as far back as 700 years ago. How long do you thing our current buildings will last? Maybe it’s time to reevaluate building practices…
For more information on these very interesting buildings, check out their wikipedia page.
Also read this informative NY Times article on the decline of their use.
Check out this Google Map link to get a clearer picture