The Empire State Building has been the most recognisable building in New York for almost a century, though it was surpassed in height by the World Trade Center in 1972 and by the new One World Trade in 2014. At 443 metres to the tip of the antenna, it remains the tallest building in Manhattan. The Art Deco lobby alone is worth visiting; the observation decks on the 86th and 102nd floors offer some of the best elevated views of the city available.
Skip it if the Empire State Building line is very long (it often is). The Top of the Rock at 30 Rockefeller Plaza is an alternative with arguably better views of the Empire State Building itself. For the best view of Manhattan from the south, the free Staten Island Ferry gives a spectacular approach to the skyline. But the Empire State's observation deck on a clear night remains one of New York's iconic experiences.