William Gropper, Construction of a Dam, 1939, Department of the Interior (courtesy of the U.S. General Services Administration, Fine Arts Program) It is likely that most people, including Washingtonians, think about the Department of the Interior rarely, if ever. In fact, the most common response to the sex and drugs scandal that rocked DOI’s Minerals Management Service last fall was probably surprise that something interesting could actually happen in the Interior Department. While those…