From the Super Mario Wiki, the Mario encyclopedia
The Canyon Narrows (Ravine Narrows in the PAL-version) is outside the Old Clockworks in Luigi's Mansion: Dark Moon. The Canyon Narrows are accessed by taking the passage behind the wallpaper inside the Canyon Hall. The Canyon Narrows is a small room. There are two pairs of ziplines over a large ravine. To the right of the north ravine is a door that takes Luigi to a Bonus Dimension.
During C-2: Underground Expedition, Luigi needs to travel across the Canyon Narrows to reach the other side of the Canyon Hall. The Mini Dimension Door shakes only during this mission as well.
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