This year marks the 15th anniversary of Open House New York, an annual celebration of architecture, urban design and public space that provides people with unparalleled access to architectural sites in New York. In honor of the weekend event, which takes place on October 14th and 15th, we recently curated a list of open access sites to check out. Now, we’re highlighting ten additional sites that do require Advanced Registration.

To whet your appetite, some of ONHY’s newly added advanced registration sites include The Bridge at Cornell Tech, one of the first three university buildings completed on Roosevelt Island; the historic Liggett Hall on Governors Island, a former military barrack, which will have its secret archway gymnasium open to the public for the first time; rare access to New York Transit Museum Archives, which contains thousands of artifacts telling the story of mass transportation in New York City; the American Copper Buildings, where visitors will tour the building’s newly completed skybridge and much more.

In partnership with Open House New York, Untapped Cities is also excited to announce a giveaway for a Weekend Passport, a VIP pin that gives the wearer and a guest front-of-the line access to as many as 150 participating sites. To enter the contest, see our Rafflecopter embed below. You can win entries by interacting with us on Instagram, Twitter, and Facebook! The giveaway will run until end of day October 7th, 2017.

a Rafflecopter giveaway

In the meantime, here are 10 must-visit Advanced Registration sites to check out for OHNY Weekend 2017. Get your web browsers ready as registration opens at 11 a.m. on October 5th:

10. St. John’s the Divine Vertical Tour

Image via Wikimedia Commons: Kripaks

Saint John the Divine is one of the few places left in New York City that allows visitors to access to its roof. In addition to offering some insight into the Cathedral’s history and iconography, its behind-the-scenes vertical tours allow visitors to discover the Cathedral’s attic, come face to face with stained glass windows and get a spectacular, sweeping view that, on a clear day, can include the spire of One World Trade Center. To reach the top of the world’s largest cathedral, visitors must climb more than 124 feet through spiral staircases.