Voth city ship
Compared in size to a Intrepid class starship.
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Interior of the city ship.
The Voth city ship was a massive starship, which was capable of housing the majority of the Voth civilization. It was very large ship, measuring 11 kilometers in length, and was capable of transwarp speeds.
The Voth city ship located and captured the USS Voyager in 2373 and proceeded to beam the Federation starship aboard. Once aboard, the crew of the city ship established a ship-wide dampening field, which rendered tricorders, phasers, and main power inoperative. (VOY: "Distant Origin")