John Hays Hammond, Jr. built his medieval-style castle between the years 1926 and 1929 to serve both as his home and as a backdrop for his collection of Roman, medieval, and Renaissance artifacts.

Visitors to Hammond Castle Museum are welcome to explore the castle on a self-guided tour of many rooms including the great hall, indoor courtyard, Renaissance dining room, two guest bedrooms, the inventions exhibit room, the library, the War room, the kitchens, the Natalie Hays Hammond exhibit room, the tower galleries, as well as several smaller rooms and passage ways including a secret passageway. Visitors may also enjoy the beauty of the castle grounds and a view of the Atlantic shore line.

In addition to self-guided tours, Hammond Castle Museum offers a number of educational programs and prearranged tour opportunities for school and tour groups.