My favorite sculptors are Augustus Saint-Gaudens and Daniel Chester French, both American sculptors of the late nineteenth and early twentieth centuries. I highly recommend visiting French's home and studio Chesterwood in Stockbridge, Massachusetts and the Saint-Gaudens National Historic Site in Cornish, New Hampshire. The Saint-Gaudens site especially is just wonderful, and my several visits there comprise one of my aesthetic "peak experiences". Other American sculptors I like include Anna Hyatt Huntington (her Joan of Arc is the most exciting equestrian sculpture I have ever seen) and Harriet Whitney Frishmuth (I've long admired her piece The Vine in the Metropolitan Museum of Art in New York).
I like a great deal of sculpture from Classical and Hellenistic times and from the Renaissance (Michelangelo, etc.). I also like some of Auguste Rodin's work, and much enjoyed my visit to the Musée Rodin in Paris in 1990 (I even wrote a poem about the experience). Another great place to experience modern figurative sculpture is Brookgreen Gardens in Murrells Inlet, South Carolina (just south of Myrtle Beach). Among living artists, Stuart Feldman has created some extremely fine sculptures, two of which grace our home in Denver, Colorado.