MacArthur Park was a park in Los Angeles.
In 2024, Raffaela Musiker and Seven of Nine were hunting down the elusive Watcher in this city. Operating under the theory that a visitor to Earth would be using future tech, they began searching the city for subspace signals. Musiker's tricorder detected an anomalous subspace signal near this park. Soon after detection, the signal was interrupted. (PIC: "Assimilation")
Soon after, Guinan took Jean-Luc Picard to MacArthur Park to meet the Watcher, which turned out to be a dead ringer for Laris, except that she appeared to be Human rather than Romulan. (PIC: "Watcher")