The suspension bridge across the entrance to San Francisco Bay, preserved into the 24th century and seen in many films and episodes as the backdrop to Starfleet Headquarters and the Academy.
The Golden Gate Bridge, completed in 1937, spans the strait at the mouth of San Francisco Bay. In Star Trek it survives for centuries as a monument, standing next to the grounds of Starfleet Headquarters and Starfleet Academy.
It is seen in Star Trek: The Motion Picture and in Star Trek IV: The Voyage Home, where the stolen Klingon Bird-of-Prey narrowly passes it before crashing into the bay. It appears behind the Academy in episodes such as The First Duty, and in the Deep Space Nine episodes Homefront and Paradise Lost.
In The Changing Face of Evil, a Breen raid on Earth in 2375 leaves the bridge badly damaged. It has been repaired by the time of Voyager's return in Endgame, and it is still standing in the 32nd century of Discovery and Starfleet Academy.