This foreboding medieval castle was twice besieged by barons rebelling against the English king.

This tiny alleyway is now a shrine to a subculture riot between the mods and rockers.

Eliza and Mary Chulkhurst were the first famous conjoined twins in England, but it's not clear when they were born.

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

A hundred copies of Antony Gormley's naked body stare out across the water.

Much of what constituted mid-century Liverpool now litters a beach outside of town.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

The Liverpool street made famous by the Beatles is real.

The oldest known metal-mining site in England dates back to the Bronze Age.

A typographic tribute to the many comedic greats who make Great Britain laugh.

Home to the longest wooden escalators in the world.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

The pockmarks across the building's facade are remnants of the Blitz.

You will not be able to miss this building.

This ancient Egyptian obelisk still bears the wounds of World War I.

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

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

The commemorative stone column conceals a secret laboratory.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

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

Catacombs turned marketplace.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.