In the early 1970s, the ride was officially made a part of Fantasyland, but this was merely a prelude to far more significant changes. In 1973, the revolving star at the top of the Matterhorn was removed, in part because of the 1973 oil crisis that had hit the US. In 1978, the Matterhorn received a major refurbishment. Most notably, the hollow interior space was broken up into a number of small, icy caves and tunnels with far more convincing theming. Some holes in the mountain's skin were filled in as well, including the two large openings at the top of the lift hill that had allowed guests to briefly glimpse the entire southern part of the park.