10 of the tallest empty skyscrapers around the world

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North Korea's Ryugyong Hotel.
North Korea's Ryugyong Hotel.

Catriona MacGregor/Getty Images

25 vintage photos show what life was like in New York City 100 years ago

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Several tall buildings in lower Manhattan, surrounded by water
An ariel view of downtown Manhattan from the 1920s features an elevated train track, a much wider Battery Park, and the South Ferry Terminal.

FPG/Getty Images

This 660-ton pendulum protects Taiwan's tallest skyscraper from earthquakes

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side-by-side of Taipei skyscraper and massive spherical tuned mass damper
The Taipei 101 skyscraper (left) and the tuned mass damper inside it (right).

Annice Lyn/Getty Images, Richard Chung/Reuters

The tallest building in the US could be in... Oklahoma

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Left image is the 1,907 ft tall structure will be one of four towers at The Boardwalk at Bricktown development in Oklahoma City and the right image is of the base of the structure with residences, hotel and mall.
The tallest building in the US is being proposed for Oklahoma City, left, as part of a giant complex called The Boardwalk at Bricktown (right).

Courtesy of AO

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