About 8KM from downtown of Zhangjiajie lies the Tianmen Mountain, also known as Heaven Gate Mountain. It is approximately 7 mile hike and climb to Heaven's Gate. There is a Temple that is 500 years old at the top. If you do not want to hike you can take the longest cable car ride in the world.
Carpeting ripped off stairs revealed gaps on both sides of the risers and treads where the carpet once wrapped around. These gaps were filled with foam gap filler, the kind used to insulate openings up to 1” from drafts. Then the filler was wiped down to just below the top since it dries solid. After it had dried, sand-able, paintable spackle was used on top of the foam sealant and allowed to dry. Once touched up with paint, the gaps disappeared.