Gotham City (Earth-9: Post-Crisis)

"This city breeds a special class of criminal. People die here. Not just regular people. People like us."

- Dick Grayson to the Titans

Gotham City is a city in the United States of America. It is known for it's high crime rates and the numerous current and former vigilante inhabitants, such as Batman and Robin.

History
At some point, Bruce Wayne's parents were murdered in front of him, which lead him to become the vigilante known as Batman.

At Haly's Circus, the acrobats John and Mary Grayson were murdered by mobster Tony Zucco due to their bosses' failure to pay the Maroni Crime Family, leaving their son as an orphan.

Billionaire philanthropist Bruce Wayne decided to adopt him and trained him to become the vigilante known as Robin.

Some years later, Dick decided to leave Gotham to get away from Bruce, as he feared he was becoming too much like him.

He later decided to go to Wayne Manor to make amends with Bruce.