Vortex

The Church of St Peter and St Paul in Dorchester-on-Thames, a few miles south of Wallingford, contains one of England's most unusual architectural features: the Vortex. It's a carved stone spiral that spirals inward on itself, creating an optical illusion that genuinely does make your head spin if you stare at it too long. Medieval craftsmen left us this curious puzzle, and no one's entirely sure why.

You'll find it tucked inside the church itself - it's not a separate attraction, but rather a detail you discover while wandering through this proper ancient building. The village of Dorchester is small and genuinely worth the diversion. The church is medieval and substantial, worth exploring for far more than just the Vortex. Bring a torch if you visit in low light; the carving sits where shadows gather.

This works well if you're staying at one of the nearby campsites like Ridgeway View or Rolling Fields Glamping - it's a pleasant walk or short drive from Wallingford itself. Admission is usually free (this is a working parish church), though donations are welcome. You'll want perhaps 20 minutes to find it and properly examine it, longer if you take time with the rest of the building.

History enthusiasts and anyone with a taste for oddities will get the most from it. Children often find the optical illusion genuinely compelling. It's not a destination in itself, but paired with a walk around Dorchester village or a broader exploration of the Oxfordshire Thames Valley, it's absolutely worth the detour.