An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

The fences outside some of South London's estates are made from recycled World War II stretchers.

The London statue that imitates passersby.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

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

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

This unassuming building produced some of the world's most famous bells.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

A celebrated bandstand at the center of what was once the worst slum in London.

Be on the lookout for the symbolic insect all over the city.

The red letters in the literary pavement leading to the library form a mysterious code.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

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

A mysterious shape catches the eye in this 16th-century painting.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

A striking memorial to the Jews of Leiden who were murdered during World War II is scattered throughout the city.

This early 19th-century graveyard is the final resting place of Vincent van Gogh's mother.

This century-old street sign is a forgotten remnant of the old city.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

This towering church is home to a world-famous organ and a treasure trove of medieval art.