Singapore is a tiny, densely populated island city-state that’s almost entirely urbanized, but it?s also the greenest city in Asia, and its vegetation covers more and more ground with each passing year. You probably wouldn’t expect such a lush, vibrant, and tropical place to boast some of the most innovative architectural designs in the world. The country is so committed to marrying the natural and metropolitan worlds that it requires its developers to replace any greenery they might displace when constructing a new building. For this reason, it?s not so surprising that it will be the home of the world?s largest indoor waterfall, which is being built into the new “Jewel Changi Airport” extension of the existing Singapore Changi Airport.
What better way to welcome visitors to a place known for its clever integration of architecture and plant life than a jaw-dropping feature like this" Imagine stepping off of a plane feeling parched and haggard after a long international flight and walking right into a temperate jungle with a 131-foot waterfall at its center, streaming out of a massive hole in the ceiling like something from a sci-fi movie. Conceived of by water feature design firm WET in collaboration with Safdie Architects, the cataract will stand as the centerpiece of ?”Forest Valley,” the airport?s new indoor garden.

Set beneath a massive glass dome, the forest will be planted in a series of tiers to resemble a hilly landscape. ...