These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

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

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

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The attic of a four-century-old canal house hides a clandestine church.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

One of two giant blue cockerel statues erected with an intentional double meaning.

No one's quite sure where this quirky university tradition originated.

A palatial art deco restroom.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

The oldest continually used church in Minneapolis also sells great meat pies.

The only arched bridge made of stone on the entire Mississippi River.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

When flour explodes, it's not a pretty sight.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

A butcher shop in Minneapolis has all the meats and cheeses you’d expect from any of its kind—except that all the products are vegan.

Art in the form of a winding, man made crack in stone.

Faceless white figures loom over the city from the rooftop.

The key to turning shifting dunes into the green oasis of Golden Gate Park.