Man-Made Marvels

Our world is full of wonders great and small, ancient and contemporary, natural and man-made. Here are 15 modern marvels that fill us with awe through the sheer scale, beauty, backbreaking effort and inspiration that brought them into creation.

Man-Made Marvels: Henderson Waves

At 12 stories high, Henderson Waves is Singapore's tallest pedestrian bridge. It snakes across Henderson Road, connecting Mount Faber Park and Telok Blangah Hill Park. The bridge, which opened in 2008, is made of seven undulating curved steel ribs that alternately rise over and under its deck. The curved ribs form alcoves that function as shelters with seats within.

Man-Made Marvels: The Ledge at Willis Tower

Not afraid of heights? Check out the view from the Ledge at Willis Tower, formerly Sears Tower, in Chicago. The five-sided balconies, which opened in 2009, are suspended 1,353 feet in the air and jut out 4 feet from the building's 103rd floor Skydeck. They're actually more like boxes than balconies, with transparent walls, floor and ceiling. Visitors can see unobstructed views of Chicago from the building's west side, and a heart-stopping vista of the street and Chicago River below if they're brave enough to look straight down.

Man-Made Marvels: Palm Jumeirah

Palm Jumeirah is an artificial island, the first and smallest of the three Palm Islands created off the coast of Dubai, United Arab Emirates. The palm-tree shaped island is so large that it can be seen from the International Space Station. It is currently home to luxury homes and the megaresort Atlantis, The Palm, and will eventually tout many other deluxe hotels. In the years since construction began in 2001, this island effectively has doubled the length of Dubais coastline.

Man-Made Marvels: Grand Canyon Skywalk

The Hualapai tribe of Arizona commissioned this horseshoe-shaped, glass walkway that opened above the Grand Canyon in 2007. The Skywalk juts off the rim of a side canyon 4,000 feet above the Colorado River. Despite the vertigo-inducing views, the glass bridge reportedly is very sturdy it can support more than 71,000 pounds and can withstand gusts of wind over 100 mph.

Man-Made Marvels: Channel Tunnel

The Chunnel, as the 31.35-mile tunnel under the English Channel is known, opened in 1994, connecting Calais, France, with Folkestone, England. It is the second-longest tunnel in the world (behind Japans Seikan railway tunnel), and has the longest underwater section of any tunnel. The Eurotunnel Shuttle is a special vehicle transport train that has the largest rail cars in the world.

Man-Made Marvels: Three Gorges Dam

Located in Chinas Hubei Province, this largest hydroelectric power station in the world contains a 375-mile-long reservoir within its impressive 7,661-foot concrete bulk. The scale of the controversial project is so huge that it has displaced millions of people, submerged hundreds of cultural sites in the Three Gorges area and precipitated an untold amount of damage on the regional environment. Construction began in 1994, but the dam is not expected to become fully operational until 2011.

Man-Made Marvels: Panama Canal

One of the most difficult engineering endeavors ever attempted, the Panama Canal is a 50.72-mile-long passage between the Atlantic and Pacific oceans that was begun by France in 1880 but completed by the U.S. in 1914. It drastically reduced shipping distances between New York and San Francisco, from 14,000 miles around Cape Horn to 6,000 when passing through the canal. During the American construction phase, 211 million cubic yards of dirt and rock were scraped away over 10 years to finish the canal.

Man-Made Marvels: Akashi-Kaiky Bridge

Also known as the Pearl Bridge, this structure spans the strait between the islands of Honshu and Awaji in Japan. Upon its opening in 1998, the Pearl Bridge became the longest suspension bridge in the world, with a center span measuring 6,532 feet in length making it a full quarter-mile longer than the previous record-holder. The entire three-span bridge is more than 12,000 feet long.

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