The rusting relics of Southampton's former luxurious flying boat industry.

This 700-year-old storehouse was a POW jail, aviation workshop, and Titanic memorial before becoming a brewpub.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

Heralded as the oldest statue in London.

The remains of the oldest synagogue in Britain lay forgotten for seven centuries, hidden under a humble shop.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

These marks in Myddelton Passage aren't your run-of-the-mill vandalism, and they weren't made by your typical vandal.

This overlooked street light once served as a KGB dead letter box.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.

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

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

A lasting remnant of The Blitz.

A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

King of the Saxons on top, Roman goddess of wisdom on the bottom.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

Pop culture has helped to keep this iconic British building from being destroyed.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Hear the quietest sound from across the dome.

The broken skateboards that became a poignant memorial to a murdered skater.

This restaurant's specialty is "a major enigma for food historians."

These ornate arches show how the course of the River Thames has changed.