A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

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

This 1920s Dutch barge is now a floating bookstore.

Catacombs turned marketplace.

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

The curios of pharmacist and collector Henry Wellcome.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

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 student driver's nightmare.

One part local history, 99 parts gruesome haunted house.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Banksy gives themself artistic license with this piece of London street art.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

A kaleidoscopic warehouse-maze of handmade neon signs.