Don't let its nondescript location fool you. Modestly housed in a converted warehouse, this privately owned collection occupies a massive warehouse in a less-than-fancy part of the fashion district. A labor of love dating to 1999, private collector Martin Margulies' 45,000-square-foot space features quirky videos, sculptures, and paintings alongside modern and vintage photography in astonishing quantity. Large sculptures by such artists as Magdalena Abakanowicz and George Segal remain permanent fixtures amidst the changing works of contemporary masters like Peter Friedl and Vincent Desiderio. The collection's downscale address only serves to ramp the cool factor of this artistic treasure trove.