Brass bricks outline the locations of Edinburgh's lost, lively market stalls.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

Amsterdam's former hotspot for public executions and dissections.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

A floating cat sanctuary on an Amsterdam canal.

The little-known second castle that William the Conqueror built in York.

The remnants of this unusual bridge await an uncertain fate.

Over 100 years ago this pyramidal holding cell was reserved for rowdy drunks but now only offers five minute sentences.

The haunting beauty of this little-visited wreck makes it a true hidden treasure.

All that remains of a Japanese fishing vessel that ran aground in 1982.

This slice of 1960s Danish modernism does not conform to the Oxford college stereotypes.

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

Half-drowned wooden stumps and stone blocks are all that remain of a Victorian landing that was destroyed by storms.

Seat of the Duke and Duchess of Devonshire for centuries.

One of Europe's oldest libraries.

Haven for Cape Fur Seals, until the Ring of Death of jumping Great White Sharks arrives.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

A unique flight of canal locks that owe their form to 19th-century cost-saving measures.

This magical museum celebrates the life and work of a seminal children's book writer (and occasional spy).

A miniature village mimics the surrounding buildings so well it includes itself.

An ornate aviary built during the Victorian trend of collecting exotic birds.

This nondescript building was the birthplace of Morris cars.