Open House New York (OHNY) is a nonprofit dedicated to New York City's architecture, design, and urban infrastructure, based in Manhattan. Founded in 2001, the organization provides public access to buildings, workshops, and infrastructure sites not normally open to visitors. Its flagship program, OHNY Weekend, is an annual festival offering free tours of several hundred architecture and design destinations across all five boroughs, drawing tens of thousands of visitors. OHNY also runs educational programs and partners with building owners and institutions willing to open their doors to the public. It operates as a 501(c)(3) nonprofit and is listed in the NYC Department of Cultural Affairs directory of cultural organizations.