A large golden gate
A gate or gateway was a door or doorway on a wall or fence. Someone who guarded a gate was called a gatekeeper.
In the alternate reality, when Jim Kirk took his stepdad's Corvette for a joyride and was being pursued by a policeman on a hovercruiser, he quickly turned into a drive and crashed through the gate and drove off into a quarry. (Star Trek)
In 2381, D'Vana Tendi's family home had a golden gate at its entrance. (LD: "Something Borrowed, Something Green")