A concrete mushroom that divided Stockholm residents for nearly a century.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

A heated statue pays tribute to one of Sweden's great actresses.

One of only two commuter aerial tramways in the United States.

A crumbling hospital from the 1850s on Roosevelt Island.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This outdoor gallery of sculptures along the East River was once a landfill.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

Two New York rooftops are home to the largest rooftop soil farms in the world.