In May 2003, Dia opened Dia:Beacon, Riggio Galleries, a museum to house its renowned but rarely seen permanent collection comprised of major works of art from the 1960s to the present. Located on the Hudson River in Beacon, New York, Dia:Beacon occupies a nearly 300,000-square-foot historic printing factory. The Beacon museum's expansive galleries have been specifically designed for the display of the artworks to which Dia is committed, many of which, because of their character or scale, could not be easily accommodated by more conventional museums. Works installed at the museum range from Andy Warhol's 1978 Shadows (a single work comprising multiple canvases); to three of Richard Serra's monumental sculptures in the Torqued Ellipses; "monuments" for V. Tatlin, a series of fluorescent light works by Dan Flavin; several mixed-media installations by Joseph Beuys and Agnes Martin's 1999 paintings Innocent Love, among others. Each artist's work is displayed in a dedicated gallery or galleries: in many cases these presentations were created in collaboration with the artists themselves.