Architect John Hix—who, as one might gather, worked under renowned American architect and concrete aficionado Louis Kahn—designed the hotel Hix Island House in Vieques, off Puerto Rico. The latest guest house on the property is called Casa Solaris and is entirely removed from the commercial grid, running completely on solar power. Photo by Michael Grimm. Photo 15 of 30 in Favorites by Oleg Knyazev from Modern Concrete Getaway in Paradise

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Architect John Hix—who, as one might gather, worked under renowned American architect and concrete aficionado Louis Kahn—designed the hotel Hix Island House in Vieques, off Puerto Rico. The latest guest house on the property is called Casa Solaris and is entirely removed from the commercial grid, running completely on solar power. Photo by Michael Grimm.