An upside-down skyscraper, a line-shaped city, the largest floating structure on the planet. These aren’t settings from a science fiction novel; they are real projects currently in development as part […]

The population density of a city shapes everything about daily life there — from the height of its buildings to the crush of its streets. But which cities pack the

For plants, humans, and animals, water is an essential part of life. This is one of the reasons so many of the world’s cities have been established along rivers. They

The United States can be divided into five different geographical regions, and of these, the Western US is the largest. It extends from the Pacific Ocean to the Midwestern US

There are many countries with declining populations in the world, and they can be found on almost any continent. A variety of causes are responsible for these declines, but low

Zoos have come a long way from the private collections used to show wealth and power by rulers in ancient times. Although it can still be a contentious subject, most

Shopping malls have appeared all over the world in the last century. While the term “shopping mall” may have gained popularity in North America, the largest malls in the world

The surface area of the world is 510,072,000 square kilometers (196,939,900 square miles), and about 71% of this area is water. The remaining 150 million square kilometers of surface area