Art Sites 651 W Main St, Riverhead, NY11901 Art Sites is an art gallery on W Main Street that sits on the Peconic River front. Run by Glynis M. Berry and Hideaki…More Ariizumi, the gallery also doubles as their office as architects, evident from the signage on the front of the building which reads: "architecture + art." The gallery is open Thurs. - Sun. from 10 a.m. to 5 p.m.