NW corner Erkenbrecher and Dury Avenues (Avondale)

• National Historic Landmark – Listed February 27, 1987
• National Register of Historic Places – Listed February 27, 1987 (No. 87000905)

Significance: The second oldest zoo in the United States, it opened to the public in September 1875. Significant for the antiquity and richness of its collections and for its efforts in the propagation and nurture of rare and endangered species, it was well-known as the home of "Martha," the last passenger pigeon. The Aviary, where she lived, the original Monkey House, and the Herbivore (Elephant) House are the zoo's earliest surviving structures.