You've also got https://news.ycombinator.com/best
There are a decent number of hidden pages, such as https://news.ycombinator.com/classic (only counts votes by users > 1 year old IIRC) and https://news.ycombinator.com/topcolors (most popular top bar colors). I figured most of these pages were hidden because 1. They weren't amazingly useful. 2. One should expect them to disappear at any time.