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

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The commemorative stone column conceals a secret laboratory.

The Great Fire of London and the regulation of one-way streets both started in this alley.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

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

An architectural oddity hides in plain sight on this iconic London bridge.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

The sculpture of the deceased cockatoo flops atop its personal plinth.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

The plunge pool is a surviving relic of a rowdy royal residence.

A masterpiece of Art Deco architecture hidden in plain sight in West London.

The remnants of this unusual bridge await an uncertain fate.

The lantern carried by the infamous Guy Fawkes when he was arrested while attempting to blow the houses of Parliament and the King of England to smithereens

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

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

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

Home to the most complete dodo remains known - one head, and one foot.

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