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9. San Francisco

San Francisco, like Portland, has fault lines and water working in its ghostly favor.

The Cameron House in Chinatown, once a hiding place for immigrants to escape the brutality of the police, was burned down with people inside – and some say they remain trapped there, even turning up in photographs now and again.

A police officer is said to roam Golden Gate Park and a former head mistress is thought to be presiding over her old girls school, now the Queen Anne Hotel.

And at Alcatraz, the damp, punishing island prison where some of the most notorious prisoners were sent, some say there are inmates serving not just life – but eternity. Visitors have reported hearing voices – and the sounds of cell doors closing.

Photo: Photographer's Choice | Court Mast | Getty Images