Dürrenmatt's concerns are timeless, but they are also the product of his Swiss vantage during the cold war: his key plays explore such themes as guilt by passivity, the refusal of responsibility, greed and political decay, and the tension between justice and freedom. Among his most well known and most successful plays are ›The Visit‹, ›The Physicists‹, ›Romulus the Great‹, ›Hercules and the Augean Stables‹ and ›The Marriage of Mr. Mississippi‹.