Introduction to the American Decorative Arts Museum: The American Decorative Arts Museum has a collection of approximately 12,000 pieces of American decorative arts, basically from the 17th century to the early 20th century. The museum has the richest and most complete collection in the world. Its 25 exhibition halls representing different times are equipped with furnishings and interior designs of the time. It now houses a large collection of silverware, all of which were collected by Paul Reeves and are owned by Tiffany & Co. Produced by.