Pike Valley Farm in Lancaster, KY (Garrard County), is working toward sustainability - pasture-raised animals, etc. Our family lives there now. The owner and his wife (Daniel and Kristin Pike) are very nice people, and they would set up an appointment to show you around. Their site is http://www.pikevalleyfarm.com/ They do not have a cob house however, though they do know about that style of building. From what I have found so far, you may have to travel outside of KY to visit a cob house.
The link for the place in Berea appears to be for Homegrown Hideaways (http://www.homegrownhideaways.org/) which does have an in-progress cob structure, but it is not complete. We visited during the 2012 Berea Solar Home tour, and Jessa, one of the owners, showed us around. Its a great place to visit, and I'd suggest it to anyone interested in natural building, but there may be better options for seeing a finished cob building.
On the Berea college campus, there is a small structure built from various natural methods. This building has one cob wall, as well as walls made using earthbags, cordwood, and straw bale. The building is next to the Sustainability and Environmental Studies House. I contacted them once about touring the building, but ended up just doing it during the Solar Tour. Information on the SENS house can be found at http://senshouse.org/.
The only completed cob home that I'm aware of in this area is located at Disputanta Cob (http://www.disputantacob.com/) in Rockcastle County. Unfortunately I've not been able to tour this home, as the owner's ill mother is currently living there. She offered to arrange a tour for me sometime, so I suspect that she'd be willing to do the same for others. The website contains contact information. There is a small, mostly complete, cob cottage on the grounds that I was able to take a look at when I stopped by.
You''re quiet welcome Natasha. Thank you for the information on Pike Valley Farm. I had never heard of them before your post. We went out there today and picked up a few items. Their price on grass fed ground beef is hard to beat.
I live in Northern ky, and currently working on the trench for our cob home. I'm posting updates at my blog and on youtube. Also, we have grown food for the last 3 yrs and working towards permaculture/polyculture systems.
For the link to the blog: http://veganslivingofftheland.blogspot.com
Willie Smits: Village Based Permaculture Approaches in Indonesia (video)