The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The ground on which Shakespeare’s initial playhouse once stood.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

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.

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

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

The ritual has been performed uninterrupted for nearly 700 years.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

These barriers stand as stark reminders of Northern Ireland's troubled past.

These engineering masterpieces are a dominant feature of the Belfast skyline.

One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.