The impressive futuristic New York State Pavilion was built in Flushing Meadows Corona Park in 1964 for the World's Fair. After the fair, the structures were left to decay, and were officially closed to the public in 1987, but two conservationists – John Piro and Mitch Silverstein – have been working since 2009 to reopen the amazing exhibition to the public once again for a few hours next month. 

On April 22, for one day only, the NYS Pavilion will be open to the public from 11 a.m.-2 p.m. Reservations are not required, but hard hats –which will be provided – are. So, if you've been planning a spring trip to the East Coast, you may want to make a quick detour to Queens for this once in a lifetime experience. 

Via: Atlas Obscura and Times Ledger; photo via Thinkstock