These are concrete logs. Really!

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Old Kentucky Concrete Logs

Beautiful log home, except it is made out of concrete logs. You heard that right. Here's some more info http://www.logcabindirectory.com/blog/concrete-log-homes

Concrete Log Siding | Log Home Interior Photos - EverLog™ Systems - Concrete Log Cabin ...

EverLasting Concrete Logs

EverLasting Concrete Logs

Old Kentucky Logs, concrete logs put on like siding...love it