House
One of the oldest ways to make a timber house is to cut tree-trunks into logs. The logs are then split in half so that there is a flat side for the inside of the wall and a round side for the outside. The logs then have big "notches' or holes cut into the ends, so that when they are piled up, the logs lock together at the corners of the building without any nails. These log cabins can be seen in Canada, in Switzerland, in Scandinavia, in Eastern Europe and in Japan.