An acoustic anomaly with a mysterious cause.

An unsanctioned shrine that sprung up outside the late singer's home is causing a stir in London's Highgate neighborhood.

This London marker celebrates the spot where the world-famous English band was founded.

The sculpture of the deceased cockatoo flops atop its personal plinth.

Where condemned pirates met their grisly end at the gallows on the River Thames.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

A memorial to a dog that inspired rioting in the streets of London.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

A naturally mummified 2,000-year-old man.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

The television series' iconic giant foot was borrowed from this classical painting.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

The anatomical-pathological collection of a man who changed surgery.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A tongue-in-cheek arcade where the games are based on everyday life.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.