Museums & Art Galleries in Nassau County Love museums and art galleries? Long Island has many to choose from and located all across the island. Below is a list of museums and art galleries in Nassau County. If their name is underlined that indicates they have a website for you to visit: Nassau County Museums & Art Galleries: Long Island Children's Museum11 Davis AvenueGarden City, NYPhone: (516) 224-5800 Craft as Art FestivalOne Museum DriveRoslyn Harbor, NY Phone: (973) 746-0091 Hillwood Art MuseumCW Post Campus Long Island University720 Northern BoulevardBrookville, NYPhone: (516) 299-4073 Hofstra MuseumHofstra University Hempstead TurnpikeHempstead, NYPhone: (516) 463-7446 (2 comments)