The Lost City of Gold is a large fortress of legend hidden deep within a section of Never Land known as Dark-Dark Valley. It was later revealed despite its name the city isn't made of gold but gets in name when the fortress is covered from the glow of the Never Night Star.
Role in the series
The Lost City of Gold first appeared in the episode "The Never Night Star". Jake and his crew were star gazing one night on Pirate Island, when they spotted the Never Star shining down upon Never Land. Cubby told the crew that it leads to the legendary lost City of Gold. The young crew set sail to the City of Gold. While they are walking through the woods, Captain Hook and his crew overhears them talking about the City of Gold. He and his crew cut ahead of them and try to slow them down by putting obstacles in their path, but the young pirate team found other ways around the obstacles. Soon, Hook takes a wrong path himself and falls down a waterfall along with the rest of the crew. Jake finds a rock that the light from the Never Star is reflecting off the path and moved it to the right direction. It was pointing down a path so the crew follows the light until it leads to another rock. The rock shines it right on to the gleaming City of Gold. Jake soon notices that by putting his sword in the way of the light the city isn't made of gold--it is just the light from the star. Captain Hook, however, doesn't believe him. He tells the crew to take every brick from the city. Jake and the crew finally scared him away with vines that looked a lot like snakes.