[Aloni_Ed_Reeve_1_1_]Ed Reeve The United Nations says that the world population will quintuple by 2300. That means cities are about to get very crowded. More than half of humanity already lives in cities, and by 2050, at least two-thirds of the population will call cities home. In major cities like San Francisco, the demand for housing is outpacing the ability to supply houses. But that growing population will need places to stay. One solution: building underground or into the existing landscape, whether that's a hill or a cliff. Lots of cities already have subterranean spaces, but as urban areas become more crammed, you can expect these spaces to multiply. Take a look at some of the world's most unique marvels that are built into the ground and cliffs. _Shivam Saini contributed to an earlier version of this story._ THE ICONIC SANTORINI HOTEL IN IMEROVIGLI, GREECE, HAS A POOL THAT'S EMBEDDED INSIDE A CAVE. THE CLIFFSIDE OVERLOOKS THE MEDITERRANEAN OCEAN. Iconic Santorini ROCKY HOMES LINE THE CLIFF FACE IN NEVSEHIR, TURKEY, ALSO KNOWN AS THE CAPPADOCIA REGION. THE AREA IS POPULAR WITH TOURISTS FOR ITS BYZANTINE ART AND LARGE NETWORK OF UNDERGROUND BRONZE AGE TROGLODYTE DWELLINGS. Chris McGrath/Getty Images FOR A MORE MODERN TAKE ON A TROGLODYTE DWELLING, LES HAUTES ROCHES IS A FIVE-STAR HOTEL CONSTRUCTED INSIDE A LIMESTONE CLIFF. THE LAVISHLY DECORATED ROOMS OVERLOOK THE LOIRE RIVER. Les Hautes Roches SEE THE REST OF THE STORY AT BUSINESS INSIDER
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