One of Oxford's greatest treasures likely belonged to the legendary King Alfred the Great.

This stretch of the River Severn where large waves flow against the current is the birthplace of river surfing.

Huge winged monument in the United Kingdom.

Seat of the Duke and Duchess of Devonshire for centuries.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

A monolithic monument in Greater London.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Catacombs turned marketplace.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

A historic house left in "dramatic still life."

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

An unusual round church in London with a Templar past.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A remarkably well preserved tower dating all the way back to the Iron Age.