Kuchisake-onna, the slit-mouthed woman

A woman in a surgical mask stops a passer-by and asks: am I beautiful? Say yes and she takes the mask off, revealing a mouth slit to the ears, and asks again. The legend erupted in the spring of 1979 in Gifu Prefecture and crossed the whole of Japan within months: schools sent children home in groups, police stepped up patrols, newspapers reported the panic. The roots are older, going back to the Edo period, but the 1979 version was the country's first case of an urban legend requiring a police response.

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Lake Pontchartrain, at the Gates of Voodoo

The vast brackish estuary beside New Orleans, on whose shores voodoo rites were held through the nineteenth century — most famously Marie Laveau's St John's Eve gatherings at Bayou St John. Traces of offerings still turn up at night: candles, coins, bones. A causeway nearly twenty-four miles long crosses the lake, and from its middle no shore is visible at all — a sensation locals count as its own reason not to drive it in fog.