Located just outside of Washington, D.C. in Potomac, Maryland, the Glenstone Museum boasts an impressive collection of post-war and contemporary art. Founded in 2006 by the businessman and collector Mitchell Rales and his art historian/curator wife, Emily, the Glenstone is set on 200 acres. The institution’s stunning campus, which includes a main building designed by Gwathmey Siegel & Associates Architects, is dotted with monumental outdoor sculptures and installations. Among the highlights are works by Richard Serra, Jeff Koons, and Andy Goldsworthy.