New York, the city that popularized the skyscraper, now has an abundance of unusually tall ones. There are now 21 buildings – mostly in Manhattan — with roof heights greater than 800 feet; three were completed within the past 36 months.

A number of these high-rise towers are residential developments, including a few needle-like structures that have generated controversy for spoiling views, driving up prices and catering to absentee owners from abroad. However, many of the recent projects represent some of the best work of modern architects from around the world, including Sir Norman Foster’s 50 United Nations Plaza building, which boasts a pool in the penthouse.

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