The ultimate New York City lover’s treasure hunt is back Friday, Oct. 17 through Sunday, Oct. 19. That’s when Open House New York will unlock doors across all five boroughs to sites that are typically off-limits, overlooked or simply underappreciated.

You can climb into old towers, walk through brand-new construction or explore the behind-the-scenes infrastructure that makes New York hum. Some tours are led by engineers or city workers, and others by artists, architects, historians and "regular" New Yorkers.

This year’s lineup boasts 341 sites — making it the biggest and longest OHNY Weekend ever, according to Executive Director Kristin LaBuz.

“We are packing 1,600 hours of programming into three days,” LaBuz said. “The first event is 12:01 midnight on Friday … and the weekend ends Su

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