What an absolutely wonderful place. The architecture of the preserved building here is unbelievable, especially the Cathedral with it's 22 onion domes. Friendly, courteous staff. You have to walk through the souvenir kiosk jungle to get to the good stuff, but they were friendly also. Actually visited in 2004, but the selection below would not let me say that. ;)
On Kizhi island (located on Lake Onega in the Republic of Karelia) collected a lot of very old unique wood architecture masterpieces. And the best is The Church of the Transfiguration. Very recommend to visit. Unique place.