Slovakia has lot of open air museums of folk architecture from 18. and 19. th century.
Very interesting is also Slavic architecture from 9 th. century. Pictures that you can see here http://www.archeoskanzen.cz/veligrad_2009.html or here http://slovanske-hradiska.blogspot.com/search/label/Domy%20Slovenov you can find in archeoskanzen Modrá in Moravia – close to Slovak borders with Czech republic. That is original architecture of old Slavs.