Marina city is a corncob-shaped building that is all Resi and was once the tallest all resi building in the world.
It has also been called the city within a city because it has a Gym,Theatre (now the house of blue's), Swimming pool, Ice rink, bowling alley, Several stores and restaurants and.... you guessed it! A marina.
Those facts are from:
http://en.wikipedia.org/wiki/Marina_City
This Pic is also from wiki.