I spent a day on Tianmen in 2016. After the 99 hairpin turns (see slideshow above), we reached a platform where we could view the big erosion hole at the top of 999 stairs. For those who didn't want to walk the interminable stairway to heaven, there is an option to go up one of the world's longest escalators to the top. The views are breath-taking, as are all views from China's sacred mountains. We meandered along several paths to get to the glass walkway. At the time, that was the coolest glass-related walking we could do, but since that time an enormous glass bridge, that goes from mountaintop to mountaintop, is available for the brave travelers willing to try it.
The way down the mountain was an amazing 30 minute ride on the world's longest cable car. Most of the things we did are not great choices for those afraid of heights, but for me, it was a fantastic adventure with some awesome high school students, teacher friends, my dad and my son, Max.