Twists of Tongtian

Hairpin turns, all 99 of them, make driving Tongtian Avenue something of a hair-raising adventure, even for the most experienced motorist. This wildly curvy route is also called the 'Avenue Leading to the Sky' and for nearly 7 miles it snakes toward the top of Tianmen Mountain in China's Hunan Province. There's an alternate way up, but it's not much better for the faint of heart: What's considered the world's longest high-mountain cable car system ascends over 4,000 feet.