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

5. Tianmen Skywalk, China

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.