The USS Voyager sits dwarfed by the Caretaker's array.
The Caretaker's array was a large space station in the Delta Quadrant not far from the planet Ocampa. Built by the Nacene, the array served as a location from which the Caretaker could protect and serve the Ocampa. It acted as an energy source for the underground Ocampa settlements and continually pumped energy into the Ocampa city for nearly 1,500 years.
It was armed with energy weapons and contained medical and holographic facilities. It was also capable of generating a displacement wave that could drag ships from other parts of the galaxy.
After the Caretaker died in early 2371, the array was ordered destroyed by Captain Kathryn Janeway of the USS Voyager, in order to prevent the Caretaker's advanced technology from falling into the hands of the Kazon. A pair of tri-cobalt devices was enough to trigger the station's destruction. (VOY: "Caretaker")