Few networks can lay claim to creating the modern TV landscape as much as HBO. Beginning in the late 90s, the premium cable network basically single-handedly defined the idea of "prestige TV" in the popular imagination, releasing a near-constant stream of boundary-pushing shows that gave audiences a new concept of what episodic entertainment could do. While not every series they greenlit was a huge success, the list of projects that are considered modern TV classics is astonishing, from The Sopranos to Deadwood to The Leftovers and beyond.