Mark your calendars: the best weekend of fall 2015 will take place on October 17 and 18 when the annual Open House New York extravaganza brings city dwellers inside dozens of significant buildings, private homes, and usually off-limits spaces. Many fan favorites will once again open their doorsincluding the Ford Foundation, Brooklyn Army Terminal, and Newtown Creek Wastewater Treatment Plantand a slew of new sites are joining the fun. New additions include the recently renovated City Hall, Google's headquarters in Chelsea, the beloved World's Fair New York State Pavilion, several "architectural gems" on CUNY's Bronx Community College campus, and the National Lighthouse Museum on Staten Island.

OHNY is parlaying its year-long program The Final Mile: Food Systems of New York into a special selection of tours at food-producing sites. Brooklyn Grange, the city's, and possibly the world's largest rooftop farm, will open its outpost in Long Island City, where kitchen incubator Entrepreneur Space will also open its doors. In Industry City in Sunset Park, visitors will get to go behind the scenes of Hana Kitchens, a commercial kitchen for food start-ups.

More than 20 interior city landmarks will also participate to celebrate the 50th anniversary of the Landmarks Law. New Yorkers will have a chance to tour the iconic Woolworth Building, Bronx General Post Office, and the Art Deco Marine Air Terminal at LaGuardia Airport.

The full list of sites will be revealed in early October, so stay tuned.

· Open House New York 2015 [offcial]

· OHNY coverage [Curbed]