Well i guessed "cats", cause it ran for so long, but i looked it up and the answer is actually Phantom of the Opera:
"It is now the longest-running Broadway musical of all time, breaking the record held by Lloyd Webber's Cats on January 9, 2006 with its 7,486th performance. With worldwide gross of US $3.3 billion, total worldwide box office takings of over £1.8bn ($3.2bn), and an attendance of 80 million, it is the highest-grossing entertainment event of all time, The New York production alone has played to an attendance of eleven million people and grossed US $600 million, making it the most financially successful Broadway show in history."
Hope i helped! :-)
Friends with Benefits grossed $150,483,765 worldwide.
Muppets Most Wanted grossed $51,178,893 in the domestic market.
Malibu's Most Wanted grossed $34,308,901 in the domestic market.
Avatar has grossed over $2.05 billion worldwide.
Friends with Benefits grossed $55,802,754 in the domestic market.
cats
The Dark Knight Rises has grossed the most worldwide.
war of the worlds
Muppets Most Wanted grossed $68,493,504 worldwide.
Malibu's Most Wanted grossed $34,499,204 worldwide.
Friends with Benefits grossed $150,483,765 worldwide.
Muppets Most Wanted grossed $51,178,893 in the domestic market.
Malibu's Most Wanted grossed $34,308,901 in the domestic market.
Training Day grossed $104,505,362 worldwide.
James Cameron's "Avatar" (2009) has grossed $2.8 billion worldwide.
Mad Max grossed $99,750,000 worldwide.
To date, Avatar has grossed over two and a half billion dollars worldwide.