I just found out about Michigan having the only statewide log cabin festival every year on the last Sunday of June. This year it falls on June 29th. There are festivals, tours and open houses. The Log Cabin Society of Michigan sponsors this event and is responsible for discovering, preserving and promoting log cabins in Michigan. For only $1, they provide you with a map that has 100 log cabins on it available for touring or drive-bys. A handful of these log cabins were built before 1840. There is a mixture of historic and new log cabins on their list across the state. I am hoping to coordinate my schedule to see a few of these. How great would that be to step back in time!
If you live in Michigan, chances are that there is a log cabin on this list that's within driving distance. Here is the link: http://www.qtm.net/logcabincrafts/brochure.htm