In another fascinating article, the writers at Atlas Obscura talk about the Ice Slides of Russia. They describe that during the 15th and 16th-century Russians at the time would build these massive wooden structures 70 to 80 feet tall that spanned hundreds of feet long called flying mountains.
The structures were covered with water daily, and once frozen people would settle into a sled (nothing more than a hollowed block of ice stuffed with a bit of straw) and sled down a 50-degree slope.
It’s safe to say that this was not safest of activities, but it was a great way for daredevils and adrenaline junkies to get a rush at the time. It’s also noted that at one time Catherine the Great slid down herself. Read more about the Ice Slides here.