Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

A sculpture serving as an homage to Pope John Paul II.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

A statue commemorating the perilous journey made by the monks who delivered the body of St. Cuthbert.

A rather grand, but tiny, folly on the banks of the River Wear associated with a Polish count.

An unusual stone chair can be found on the banks of the River Wear, not far from Durham Cathedral.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

A unique tribute to the millions of animals who served and died for the British military.

Dictionary Johnson’s favorite feline.

This sprawling, Brutalist estate feels like a city within a city.

A hands-off space for graffiti artists to hone and display their skills.

An obscure walkway dedicated to a scientist who helped pave the way for the world to sit up and take notice of Manchester.

Once called "the biggest room in the world," this Victorian-era hall is so large that it contains a smaller 1970s heptagonal theatre.

When the city of Manchester built a new centralized heating network, they did it with style.

Since 1995, two red-painted metal figures have guarded the entrance to the Northern Ballet.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Europe's official "zero-level," the equator of elevation.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A building-sized painting of the renowned 19th-century American abolitionist.

The lasting remains of a bygone era of open-air meat markets.

A plaque commemorates a Victorian scientist's monumental discovery about waves.

This statue stands as a message against the ills of Apartheid.