OHNY is teaming up with Docomomo (an organization dedicated to the preservation of modern design) to take visitors to Marcel Breuer's Brutalist concrete structures at Bronx Community College, including Meister Hall (pictured). Tours happen on Sunday, October 18.

Tours of this 1937 building will be led by Studio V Architecture, which is currently working with Youngwoo & Associates on a master plan to renovate the space. Once completed, it will be a mixed-use development (with a smaller post office on site). Tours happen Saturday, October 17, and reservations are required. [Rendering by Studio V Architecture]

Bibliophiles, get ready: This tour takes visitors all over the Brooklyn Public LIbrary's beautiful Central Library, with stops including the Brooklyn Collection (where you'll find historical ephemera), the Trustees' Room, and—gasp!—the stacks underneath the building. Tours happen Sunday, October 18, and reservations are required. [Photo courtesy Brooklyn Public Library]

OHNY has introduced food-centric tours on Friday, October 16, including this behind-the-scenes look at some of the producers who've made their home in Sunset Park's Industry City complex. Some of the producers you'll visit include Colson Patisserie, One Girl Cookies, and Blue Marble Ice Cream. Reservations are required.

After an extensive renovation, this 1920s-era Wonder Theater reopened to the public earlier this year. During OHNY, culture vultures can take self-guided tours of the ornate building, including its lobby and theater. Tours happen Sunday, October 18. [Photo by Ben Helmer]

This tour has two purposes: Artist Xenobia Bailey will be on hand to discuss her colorful piece Funktional Vibrations, which adorns the brand new subway station. The second part will take visitors to Hudson Park, where representatives from Michael Van Valkenburgh Associates will discuss the landscape architecture of the space. The tour happens Saturday, October 17, and reservations are required. [Funktional Vibrations by Xenobia Bailey, photo by Rob Wilson]

For those who are interested in what an average day is like for a Google employee, take this tour: You'll see workspaces, the cafeterias, a game room (!), and other startup-office amenities. Tours happen Saturday and Sunday and reservations are required. [Photo courtesy Google New York]

New York City's civic seat is in the midst of a years-long renovation, and on this tour, you can see some of the fruits of that labor. Some of the principals involved in that renovation will be available during the day to answer questions. Tours happen Saturday, October 17.

This club along Gramercy Park is typically closed to the public, so now's your chance to explore its ornate interiors, including the parlor and the bar, which is covered by a beautiful 19th-century stained glass cupola. Tours happen Saturday, October 17. [Photo by Shannon Nallan]

Governors Island's Outlook Hill recently reached its full, 70-foot-tall height, and on this tour, visitors can come to the now-closed park and get a preview of the site. There's only one tour, happening October 17, so expect reservations to go quickly.

This tour will be like catnip for transportation nerds: Visitors can go behind the scenes at the Department of Transportation's traffic management center in Queens, learning what it takes to keep the city moving. One tour happens Saturday, October 17, and reservations are required. [Photo courtesy NYCDOT]

There's at least one good reason to visit the beleaguered LaGuardia Airport: This stunning Art Deco terminal, which was created as part of the Works Progress Administration initiative and illustrates the glory of flight. Tours happen October 17 and 18. [Photo by Timothy Vogel via Flickr]

The rest of the World's Fair site in Flushing Meadows-Corona Park is also open during OHNY: Docent-led tours will take visitors to landmarks like the Unisphere, among others. Reservations are required. [Photo by Brendan Crain]

One of New York City's oldest homes will be open to the public for OHNY. Visitors to this Queens residence can see its two structures—an 18th-century stone house and an addition built by the Onderdonk family in the 19th century—and learn about its ongoing restoration process. Tours happen October 17 and 18. [Photo by Linda Monte]

This brand new museum opened in August, and visitors during OHNY will have the chance to explore its historic buildings, exhibits, and a pier that's on-site. There will also be activities for kids. Tours happen October 17 and 18. [Photo by Emily Kreytak]