Terracotta was popular for architectural ornament from the 1870s until the early 20th century. Older buildings in New York that otherwise don't have much to recommend them often have charming terracotta ornament, some of it very elaborate. Below are some photos of it I've collected over the past couple years. This is decorative rather than fine art, but the quality is very high - and although I may not be inspired to great deeds by the final product, I'm still impressed by by the knowledge and effort that went into the design and execution of these bits and pieces.
The first 3 pieces are from Brooklyn, the others from Manhattan. If you're really curious about the precise locations, post a question and I'll look them up for you.