Lost

Lost is a drama. It lasted 6 seasons. It is about the survivors of a plane that crashed on an Island.
I started watching lost three days after it officially ended. I watched 6 season in less than three months (that seriously can't be good...) Lost is one of the best shows I have ever watched. It has cliff-hanger episode conclusions. Characters can die in it (and oh boy they do.) Near the end of the sixth season I got really depressed since the show was ending. I had begun to feel really connected to the characters. When the show ended, I felt really sad, but at the same time confused. The end was a bit of a cliff-hanger itself. Despite that, everything fit really well together in the end.
In my opinion, the first two seasons were the best. After those two, the show turned from a survival drama into more of a sci-fi fantasy adventure. Smoke monsters, time travel, polar bears living on a tropical island were introduced. When I first started watching the show, I bet my brother that by the end, a volcano and tsunami would hit the island, and a super hero would show up and take control of the plot. I was pretty much right. Though at some points, the people controlling the show (writers, directors) seemed to be pushing the plot a little to far, I never ended up disappointed in the show. All of the crazy extra stuff came together with the normal plot and somehow, made something beautifully enjoyable.