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20 W 34th St, New York, NY 10001 · Official site ↗
Opened in 1931, the Empire State Building reigned as the world's tallest building for nearly 40 years until the World Trade Center surpassed it in 1970.
Reserve a timed-entry slot in advance and expect an airport-style security screening; visibility isn't guaranteed and the building doesn't refund for cloudy or hazy days.