Green-Wood Cemetery Gates, 25th Street, 1899.

The Gothic Revival entrance gates and clocktower were designed by the firm ecclesiastical architect Richard Upjohn and son Richard M. Upjohn — both Brooklyn residents, later interred at Green-Wood — and completed in 1865.

As described the Landmarks Preservation Commission's 1966 Designation Report, the Upjohn-designed entrance "represents an ingenious linking together and piling up of architectural elements to create an impressive main gateway to the cemetery."

Green-Wood's gates are also home to an unexpected population of cemetery guests: a colony of monk parakeets, allegedly escapees from an illicit shipment to Idlewild Airport (JFK).