The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Hear the quietest sound from across the dome.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Rebuilt remains of a temple to Roman god Mithras.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A student driver's nightmare.

Northern Ireland's Brobdingnagian stepping stones.

An unusual round church in London with a Templar past.

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

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

Banksy gives themself artistic license with this piece of London street art.

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

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This influential Renaissance-era library was once the haunt of kings and monks.

The unfinished final resting place of some of Spain's most prominent politicians.

This enormous censer uses a pulley system installed over 400 years ago.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.