Main Branch, New York Public Library, 1908.

Perhaps one of the most recognizable buildings in the city, the Main Branch of the New York Public Library was built on land that had served as the Croton Reservoir since the early 1840s. In the late 1890s, the newly established library announced an open competition for the creation of a new building. The commission was awarded to the (then largely unknown) firm of Carrère & Hastings.

After two years of dismantling the reservoir, the cornerstone for the new structure was laid on November 10, 1902. The resulting edifice, which was then the largest marble structure constructed in the United States, was designed to the wishes of the library's director. Dr. Billing envisioned a grand reading room constructed on top of seven floors of stacks and a complex system for book retrieval and dissemination. Dedicated on May 23, 1911 (the 16th anniversary of the merger that created the new centralized institution) the new library installed 75 miles of shelving for its one million books.

The library was immediately an overwhelming success, with between 30,000 and 50,000 visitors on the very first day. The iconic stone lions that grace the entrance to the library had a bit of an identity crisis in their early years. First named "Leo Astor" and "Leo Lenox" (for the library's founders), they were then referred to as Lord Astor and Lady Lenox (though, obviously, both lions are male) before being christened "Patience" and "Fortitude" by Mayor La Guardia during the Depression. His nicknames nodded towards virtues that he felt New Yorkers would need to possess during the difficult financial times.