Maldon, Essex

Mathematical Gazetteer of the British Isles

Ripley's Believe It or Not! [1] says the only triangular tower on an English church is at All Saints, Maldon, Essex .
See THIS LINK

References (show)

1. Pocket Books, 7th series, 1960, p.67

The Mathematical Gazetteer of the British Isles was created by David Singmaster.
The original site is at THIS LINK.