Smithsonian

Pollution is threatening the structural integrity of the Taj Mahal, prompting local officials to scramble for ways to preserve the historic site.

In the 1920s, when the concept of a big city like New York was still new to many Americans, one newspaper columnist brought the city to small town America.

A city in decline for decades, Cleveland is showing signs of recovery, according to this article from Smithsonian.

This collection of photographs from Smithsonian documents the construction of the recently opened bypass bridge at the Hoover Dam.

Urban agriculture is becoming a well-known idea all around the world. Most of it is done at the small-scale, but there's still the idea of creating large skyscraper farms to feed our cities. Smithsonian takes a look at the idea.

Smithsonian explores micronations, tiny utopian city-states that strike out on their own - whether or not their current government recognizes their independence.

Isfahan is one of Iran's fastest growing cities. But it also has a distinct history -- one that is being threatened by the rapid pace of growth. Now, locals are trying to preserve the city's heritage.

The Chinese coastal city of Macau has passed Las Vegas as the biggest gambling city in the world. This article from Smithsonian Magazine looks at how it got there.