Glenstone presents rotating exhibitions of modern and contemporary art drawn from its own collection and a selection of outdoor sculptures by modern and contemporary artists, sited on 200 acres (81 ha) of lawns, meadows, and woods in Potomac, Maryland. The first museum building, designed by Gwathmey Siegel & Associates, opened to the public in 2006. A second museum building, designed by Thomas Phifer and Partners, began construction in 2013. The collection continues to expand. Admission to Glenstone's exhibitions (such as a retrospective of the work of Peter Fischli and David Weiss) is free, with advance reservation required.