The downhill events of the  1972 Sapporo Winter Olympics were held on custom-made ski runs on the south west slopes of Mt Eniwa in Chitose City, Hokkaido. The location was chosen after no suitable venue could be found within the borders of Sapporo City, the official host city of the Olympics. A brand new 31 person ropeway, ski lift, heliport and other related facilities were all constructed - on the condition that they would be completely dismantled after the Olympics, and that the mountain would be restored to its original state.

More on this fascinating story over on the SnowJapanHistory site here:

https://www.snowjapanhistory.com/hokkaido-chitose-1972-sapporo-winter-olympics-mt-eniwa-downhill-courses