Skyscrapers are a common sight in our modern urban landscape, but a high-rise 88 meters below ground is something few have seen before. On the outskirts of Shanghai, a newly completed luxury hotel, which “hangs” on the cliffs of an abandoned quarry, is attracting attention from around the world for realizing one of the most challenging concepts in architectural history. Join CGTN’s Xu Mengqi to explore how the hotel was built.