Gotham City

Gotham City is the location where both Batman and Robin rapped during Batman vs Sherlock Holmes.

Information on the Location
Gotham City is a fictional American city appearing in comic books published by DC Comics, best known as the home of Batman. Batman's place of residence was first identified as Gotham City in Batman #4 (Winter 1940). New York Times journalist William Safire described Gotham City as "New York below 14th Street, from SoHo to Greenwich Village, the Bowery, Little Italy, Chinatown, and the sinister areas around the base of the Manhattan Bridge and Brooklyn Bridges". There are many villains here, such as the Joker, Penguin, Poison Ivy, the Riddler, Scarecrow, Mr. Freeze, and more. It is arguably the most famous fictional city.

Appearance in the Rap Battle
This is the location where Batman and Robin rap. In the beginning of the battle, Batman raps on the rooftop of a Gotham City skyscraper, and halfway through he glides down to the streets to rap. Robin also raps in a similar manner, by starting from the side of a building and dropping down to the streets later.