These are some of the coolest underground buildings in the world

Today, more than halfof humanitylives in cities.And we're only getting more urban by 2050, at leasttwo-thirds of the world's population will call cities itshome.Yetyou can addonly so manyskyscrapers to squeeze in the flocking masses.Buildingunderground, however, is an option.According to a2013report bythe US National Research Council, exploringunderground "may be the most successful way to encourage or support the redirection of urban development into sustainable pattern." While expertsfigure out whether digging into the groundcan solve the urbanspace problem, we take you to someoftheworld's most unique underground marvels.Built in 2009 in the memory of a Korean poet, the Earth House in Seoul has two courtyards connecting six single rooms, a kitchen, a study, and a bathroom with a wooden tub and toilet.Built into a rock, the Temppeliaukio Church in Helsinki gets ample sunlight through a glazed dome. Those rough rock walls were left untouched by the designers for a reason: naturally great acoustics make the church a perfect venue for concerts.The world's largest underground business hub in Toronto is home to nearly 1,200 stores employing more than 5,000 people across a 4 million square feet space ' all weaved through a 29-km tunnel.See the rest of the story at Business Insider NOW WATCH: What Barbie would look like if she had the body of an average 19-year-old
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