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

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Eighty million natural history specimens call this gargantuan museum home.

The curios of pharmacist and collector Henry Wellcome.

An unusual round church in London with a Templar past.

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

This South London cemetery holds the remains of more than 15,000 people.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Detailed sandstone carvings show an array of symbolism and adorable animals.

Used as an example in one of the first dictionary entries for "museum" in 1706.

This trio of neolithic stone monuments are fabled to be a king and his knights that were petrified by a witch.

One of these two land speed record-breaking vehicles went so fast it shattered the sound barrier.

6000-year-old site covered in more than 50 megaliths.

This haunting stone chasm is a hotbed of mossy rock and English legend.

This 15th-century fortification was built to defend bunnies.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

The stately remains of Llywelyn the Great's mighty fortress.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

Three bridges straddle a stream, one stacked upon the other.