In 1859, San Francisco businessman Joshua Norton declared himself Emperor Norton of The United States. And it worked... sort of.

From the fortress of an eccentric sewing machine magnate to the lavish palace of love built by a wealthy hotelier, these castles in New York are an homage to the golden age of American industrialism.

Slated to become the world's most populous country in the coming decades, Delhi has another problem to grapple with: being the world's most polluted city.

While some may perceive Iran as a country clinging to anachronisms, the astounding architecture of Tehran begs to differ.

While the American economy seems to be on the rebound, the persistence of childhood homelessness complicates the "recovery" narrative.

When numbers drop in monarch migration, there's a problem. So what's going on?

Most think of sustainable design as a new phenomenon. In actuality, it's at least over a century old.

St. Augustine, Florida is the oldest continuously occupied European-founded city in the U. S., and it's diverse architecture tells of it's long history.

Just in time for spring, these rooftop gardens convene aesthetics, environmentalism and urban savvy into one stunning package.

Siberian craters have been popping up throughout the unseasonably warm region. What's causing it?

Copenhagen is the world's greenest city. Learn more about how they got there, and what the city is doing to combat climate change.