The Disappearing Rotunda is a proven myth in Grand Theft Auto: Vice City.
Description[]
The Disappearing Rotunda is located in the backyard of the Mendez Mansion on Prawn Island. The rotunda disappears when the player is at a certain distance away from it and reappears when the player gets closer again. The most likely explanation is a glitch with the game's draw distance, making the rotunda disappear when it believes that it doesn't need to be seen.