Tianmen Mountain is a mountain located within Tianmen Mountain National Park, Zhangjiajie, in northwestern Hunan Province, China. A cable car operates from nearby Zhangjiajie railway station to the top of the mountain. It features 98 cars and a total length of 7,455 meters and an ascent of 1,279 meters.

Photograph by About Tiger on Flickr
The highest gradient is an unusual 37 degrees. There is also an 11 km road with 99 bends that reaches the top of the mountain and takes visitors to Tianmen cave, a natural hole in the mountain at a height of 131.5 meters.

Photograph by Peter Cheung
6. Seven Mile Bridge, Florida Keys
The Seven Mile Bridge is a famous bridge in the Florida Keys, in Monroe County, Florida, United States. It connects Knight’s Key (part of the city of Marathon, Florida) in the Middle Keys to Little Duck Key in the Lower Keys.

Photograph by just take me there (justtakemethere.tumblr.com)
Among the longest bridges in existence when it was built, it is one of the many bridges on US 1 in the Keys, where the road is called the Overseas Highway.