The castle still holds traces of the abandoned Roman fort it was built atop.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

These ancient ruins were the final resting place of King Henry II's mistress.

A 26-foot shark sculpture—a statement about bombs—set off a municipal battle royale.

A cornucopia of gargoyles adorns the oldest portion of Oxford’s Magdalen College.

An obsolete, long-forgotten advertising character lingers on this Sainsbury’s balcony railings.

Hidden in plain sight, this creepy sculpture watches from above.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

This centuries-old pub boasts a collection of more than 4,500 snippets of neckties from around the world.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

An unusual round church in London with a Templar past.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

Public access to clean drinking water was an instant hit among the masses.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

Preserved behind glass, the ruins of a medieval building used to store human remains.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

This pub boasts a curious history and may have inspired a Dickens character.