London's imposing stone tower is, according to legend, haunted by dozens of regal souls, many of whom met their end within its grey walls. They include Thomas Becket, whose ghost has reportedly been sighted here; Edward V and Richard of Shrewsbury (the Princes in the Tower), who were probably murdered here in 1483; Anne Boleyn, beheaded at Tower Green in 1536; and Catherine Howard, who was executed six years later