This genuine, blood red Jolly Roger was captured off the North African coast in 1790 by Admiral Richard Curry.

This curious Tudor-era castle was once home to Napoleon's greatest adversary, the Duke of Wellington.

A disastrous D-Day rehearsal was relatively unknown until this sunken tank was discovered 40 years later.

One of the most studied Iron Age settlements in Europe.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

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

The bones of two medieval royal lions were discovered at the historic fortress.

This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

This star-shaped military outpost is now simply trying to protect itself from neglect.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

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

Parts of this former military training ground may have inspired parts of J.R.R. Tolkien's famous fantasy series.

It's believed King John of England stayed at this 13th-century castle before riding off to sign the Magna Carta.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

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

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

This early Norman castle was the first historical monument protected by an act of Parliament.

London's amazing modernist public square that never was.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Hear the quietest sound from across the dome.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.