This 1920s Dutch barge is now a floating bookstore.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Catacombs turned marketplace.

The commemorative stone column conceals a secret laboratory.

The pockmarks across the building's facade are remnants of the Blitz.

This pub boasts a curious history and may have inspired a Dickens character.

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

The medieval woodcut-style artwork chronicles life in medieval London.

Murals of the wild parties once held on the frozen River Thames.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

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

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

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

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

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

On a wall in linear London, a plaque hangs at the high water mark of one of the worst floods in fictional Kcymaerxthaereal times.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The final resting place of one of the brightest physicists of the 20th century.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.