Over a thousand shops, an ice rink, a cinema and the Dubai Aquarium, all attached to Burj Khalifa and the Fountain.
What it costs: free to enter. The Aquarium and Underwater Zoo is from around AED 100; you can see the main tank from the walkway for nothing.
Our advice: the mall will eat an entire day if you let it. Go in with two specific targets and leave. The food court is convenient and poor value — eat elsewhere.