Thought this was interesting...

The oldest known house in the world is a remarkable dwelling found at Mezhirich, near Kiev, the capital of Ukraine. It was found in 1965 by a Ukrainian farmer who was digging a new cellar six feet below his home. It is made of mammoth bones and was built about 15,000 years ago. It formed part of a village and was so strongly built that it would have lasted several generations. This would indicate that the inhabitants were settled agriculturalists rather than nomad hunters.