These barriers stand as stark reminders of Northern Ireland's troubled past.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

The ritual has been performed uninterrupted for nearly 700 years.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

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

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

This hidden green space is the city's second largest conservatory.

An incarceration museum on the spot of possibly the oldest prison in England.

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

Eighty million natural history specimens call this gargantuan museum home.

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

The second-longest pier in the U.K. stretches a whole kilometer into the Irish Sea.

One of the largest objects salvaged from the famous sunken passenger ship.

A plinth outside a church displays sculptures by local artists.

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 first ‘Harry Potter’ film.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.