By the turn of the 20th century, the Guastavino Company was well established, and the firm saw tremendous success in the ensuing decades. During this period, the Guastavinos contributed to the design and construction of more than 200 New York City landmarks, exercising a profound influence on the city's architectural character. A series of new projects for bridges and trains stations employed their vaulting for public infrastructure, beginning with the City Hall Subway station in 1904 with the architectural firm Heins and LaFarge. Photo © Michael Freeman. Courtesy of the Museum of the City of New York