17 Longest Running TV Shows of All Time, From "Grey's Anatomy" to "SVU"

• Seasons: 15
• Episodes: 331

Setting the precedent for complicated medical dramas like "Grey's Anatomy," "ER" centers around the lives of doctors and nurses at County General Hospital in Chicago as they handle the stressful and intense events that happen in the emergency room. The groundbreaking drama served as a launchpad for major stars like George Clooney and Julianna Margulies.