Buildings become abandoned for many reasons, both before and after they're built. Tall skyscrapers can be especially pricey and remain unfinished.

Ping An Finance Center, Shenzen, China. This skyscraper is far from being completed, but it shall be China's tallest at the end of the construction. It will measure 660 metres. Burj Khalifa ...

The twin towers of the World Trade Center, among the best known buildings in the world, represent only one step in the century-long evolution of skyscrapers in New York City. Here are some ...

"Generally speaking, when a project goes on hold, there is still an attempt to finish it," Ursini said, though these attempts aren't always successful. Here are 10 of the tallest skyscrapers ...