One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

This permanent exhibition of commercial signs aims to preserve the cultural heritage of the city.

Every year, the colorful murals of Montreal get a complete makeover.

The absurd creation is a compulsory destination for selfies in Buffalo.

A 19th-century architectural wonder designed by the "father of the skyscraper."

The seat of Buffalo government is a gorgeous Art Deco palace.

This giant roadside fruit is home to an array of apple-based treats.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

The giant birds honor two native North American species.

This urban oasis is a marvelous meld of music and landscape architecture.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

This unattributed sculpture in Amsterdam is hiding in plain sight.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

Twisted buildings adorn the banks of the Rhine river.

An electrical pylon under whose legs a normal gauge train can run.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Tiny memorials honor individual victims of the Holocaust.

A restaurant and observation deck built in a unique broadcasting antenna.

Berlin's old airport.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.