This London plaque marks the spot where David Bowie's famous alien made his debut.

It holds a fabulously designed tribute to astronomer Edmond Halley.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

A friendly pub with a sordid past in cock fighting.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

Dictionary Johnson’s favorite feline.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

This Underground station has been a popular filming location for decades, even before it closed.

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

England's most famous front door has an accidental doppelganger.

This black cat was actually designed to ward off bad luck.

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

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

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

London's smallest police station is barely the size of a phone booth.

An archway adorned with vulnerable flora and fauna.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

This remote camping site offers incredible stargazing opportunities.

There are two legends behind the origin of this unusually tall sanitary structure.

One of the oldest Rolls-Royce automobiles in existence, this vehicle was once driven by Henry Royce himself.

A collection of memorabilia from the estate of former professional wrestler Andre the Giant.

This controversial museum includes such detested exhibits as a chocolate suicide bomber and fecal-smelling digestion machine.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.