Game Of Thrones

 Nine noble families fight for control over the mythical lands of Westeros, while a forgotten race returns after being dormant for thousands of years.

I guess this is the only show that doesn't need a review because most people watch it. This show is based on the books written by George RR Martin. 
It's one of my all time favorite shows. It keeps you begging for more. All the characters are amazing ( the cast is so good ). It's full of plot twists and betrayal. Be careful, tissues are required because your favorite characters will die for sure.
If you love history and fantasy this show is for you. You will see some dragons too so you will enjoy it for sure.
( It's 18+ )
You can watch the trailer of season one :