This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

Another entry into the world of Edinburgh's pop-up artworks.

The most loyal of little dogs, or a Victorian era publicity stunt?

A tiny, heartwarming piece of art hiding in plain sight.

This coin collecting cod is over 130 years old, and the United Kingdom's smallest listed structure.

This monumental work of art symbolizes the coming together of a previously divided city.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

This sculpture celebrates a boules tournament and the link between Leeds and its twin city Lille.

The name of this suspended sculpture is Latin for "high horse," which is exactly what it is.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

Tiny memorials honor individual victims of the Holocaust.

A Reformation-era fiery figurehead once denoted this location as a print shop.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This platform is now a memorial dedicated to those who were deported during the Holocaust.

An abstract and eyecatching clock/fountain is the centerpiece of this little-known German city.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

The reconstruction of this prominent building fulfilled a long-written command.

Largest lake in Great Britain measured by surface area.

A 200-year-old collection of oddities and medical paraphernalia.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.