Berkeley Square's London Plane trees have been standing since 1789, which makes them older than most of the hedge funds now headquartered in the handsome townhouses around them. The square was laid out in the mid-18th century on land carved from the gardens of Berkeley House, and it quickly became one of Mayfair's most fashionable addresses.

Number 50 earned a reputation as London's most haunted house after a heartbroken recluse named Thomas Myers sealed himself in the attic in the 1860s, wandering the halls by candlelight and unnerving the neighbours so thoroughly that a judge dismissed his unpaid bills out of sympathy. The square also crops up in fiction: in Oscar Wilde's "The Picture of Dorian Gray," Lord Henry's Aunt Agatha lives here, venturing east only to inflict piano duets on the poor.

VoiceMap's self-guided audio tours thread Berkeley Square into walks exploring Mayfair's motoring heritage, Wilde's London and the city's most unsettling ghost stories, tracing everything from unofficial lap records set by racing drivers to the strange lights that once flickered in Thomas Myers's windows.