Multiple realities(covers information from several alternate timelines)
The Palace of Fine Arts was a monument that existed during the 20th century in San Francisco on Earth.
In 1986, its large dome was visible from where James T. Kirk, Spock, and dr. Gillian Taylor were driving past the Marina Green. (Star Trek IV: The Voyage Home)
In the alternate reality of 2258, the Palace of Fine Arts was located east of the Starfleet hangars and Starfleet Academy. (Star Trek)