The TWA Flight Center at JFK Airport is finally, actually, most definitely going to be turned into a hotel at some point in the next few years, but for those architecture and history nerds who never got the chance to go the iconic building, we have some good news: During this year's Open House New York festival (happening the weekend of October 16–18), Eero Saarinen's swooping architectural masterpiece will be open to the public again. The catch: It's for one day only (October 18) from 11 a.m. to 3 p.m. (Prepare yourself for lines now.)

A press release from OHNY notes that this is "likely" to be the last time that the building will be open before construction on the hotel begins. More than 4,000 people visited the TWA terminal during the 2014 festival, and the number is likely to be even higher this year, what with the whole "this is really your last time to do this" thing. The Flight Center Hotel, as it will be known, will have 505 hotel rooms, 40,000 square feet of meeting space, six to eight dining establishments, and a 10,000-square-foot observation deck. "We have been honored to be able to work with the Port Authority since 2011 to allow the public access, and look forward to opening its doors to the public once last time before it is reimagined as a hotel," said Gregory Wessner, the executive director of OHNY.

Earlier this year, Curbed photographer Max Touhey went inside the space to capture the stunning images below; of the space, he said, "You can stand in 100 different places and still be in awe. The interplay of curves is really fascinating and changes dramatically depending where you're looking from." It's worth trying to see it for yourself..

Click through for dozens more photos:

· Explore the TWA Terminal, a Pristine Time Capsule From 1962 [Curbed]

JFK's Iconic Terminal to Become the TWA Flight Center Hotel [Curbed]

· All TWA Flight Center Coverage [Curbed]