The homes were reached through tunnels. Other examples of subterranean, semi-subterranean or cliff-based dwellings in both hot and cold climates are found in Turkey, northern China and the Himalayas, and the southwest USA. A number of Buddhist monasteries built from earth and other materials into cliff sides or caves in Himalayan areas such as Tibet, Bhutan, Nepal and northern India are often perilously placed. Starting in the 1970s, interest in the technique has revived in developed countries. By setting an earth house into the ground, the house will be cooler in the warm season and warmer in the cool season.