The Phelps Mansion Museum was built in 1870 for Sherman D. Phelps, a local Binghamton businessman, by architect, Isaac G. Perry. The "Gem" is an exceptional example of the outstanding ability of Perry to coordinate into the design, beautiful rare woods, metal, and glass in the interior of the house. A beautiful Baccarat crystal chandelier from 1890 adorns the ballroom while rare chandeliers in other rooms are reminiscent of the Victorian period. Viewing the outside of the Museum, the mansard roof and cresting as well as the iron fence highlight the exterior of the museum Declared a national historic landmark in 1973, it was placed on the National Register of Historic American Buildings.