Inside a modern covered building in today’s Caerleon you can still explore the remains of the immense natatio, or open-air swimming pool, that once held more than 80,000 gallons of water.
Mewn adeilad modern dan do yng Nghaerllion heddiw, gallwch archwilio olion y pwll nofio awyr agored, neu natatio eang, a arferai ddal mwy na 80,000 galwyn o ddŵr.