Alcatraz
From Memory Alpha, the free Star Trek reference
Alcatraz is an island in San Francisco Bay. On a clear day, it can be seen from the Presidio, near the city of San Francisco.
A version of Kathryn Janeway from the year 2404 told her past self in 2378 that one could see Alcatraz from USS Voyager's ready room on a clear day, because Voyager was a museum located on the Presidio in that timeline. (VOY: "Endgame")
