The Mathematical Bridge looks, at a glance, like an elegant wooden arch. Look closer and you'll notice something odd: it's built entirely from straight timbers. No curves at all. Designed by William Etheridge in 1748 and built by James Essex the following year, it uses a voussoir arch principle, locking straight pieces into a self-supporting lattice through compression rather than brute carpentry.

Then there's the legend. Guides have been telling visitors for generations that Cambridge students once dismantled the bridge to solve its puzzle, failed to reassemble it, and had to bolt it back together in defeat. A delightful story. Also completely false. The bridge has simply been rebuilt twice, most recently in 1905, using nuts and bolts throughout.

VoiceMap's self-guided audio tours use the Mathematical Bridge to unpick Cambridge's appetite for myth-making, tracing its true engineering lineage from Westminster Bridge and placing it within Queens' College's 600-year story.