Goron City is the home of the rock-eating people, the Gorons. There are many floors, and at the first floor, there are some paintings at the wall.
At the bottom floor, there is "Big Brother's Room". It's called that because the Gorons say that Darunia, the leader of the Gorons, is their's Big Brother.
Link is Big Brother of the Gorons also when he defeats the Dodongo's inside the cavern. Link and Darunia are then 'Sworn Brothers'.