Perhaps the most spectacular grotto along the Algarve coastline.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Its collection includes a broad array of social, geographic, graphic design, and political history.

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

A surprisingly approachable statue of the man who dominated King Henry VIII's government.

This monstrous face has watched over passersby for centuries.

The fantastic charm of England's oldest botanical garden has made it a place of writerly inspiration for centuries.

A plaque marks the humble origins of an artistic muse who embodied the ideals of Pre-Raphaelite beauty.

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

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

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 memorial for public executions that dates back to the 14th century.

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

This medieval church tower has maintained its clockworks since the 16th century.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Though it's not the largest, this one-kilometer outdoor market is reportedly the longest in Europe.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of London's oldest houses contains a mixture of both old and modern features.

Likely the first car with an internal combustion engine constructed in the United Kingdom.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

London's amazing modernist public square that never was.