World's 22 Most Perilous Bridges You'd Think Twice Before Crossing

5. Tianmen Skywalk, China

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Clinging to the cliffs of Tianmen Mountain, the Tianmen Skywalk sits nearly 4,700 feet above ground. Its glass floor, only three feet wide, provides a vertigo-inducing view straight down. Walking here is a heart-pounding adventure, perfect for those who crave thrills and scenery. Each step on the glass panels suspended in the sky tests your nerve.