St Helen's sits where the River Ock meets the Thames, surrounded by almshouses that frame one of the most photogenic spots in Oxfordshire. The church itself is unusual: it has been expanded sideways rather than lengthened, giving it five parallel aisles and that broad, hall-like interior that English churches almost never have.
The painted ceiling of around 1390 is the great treasure — bring binoculars or use the church's mirror, since craning your neck is the only other way to see it. Outside, Long Alley Almshouses (1446) and Twitty's Almshouses (1707) form a quiet courtyard between the church and the river, and the small lawn beside the porch is the start of the riverside walk along the Thames.