Spanish architecture firm A-Cero sent us some snapshots of their latest modern custom house design near Madrid, Spain – an amazing travertine house that’s about as grand as they come. Set on a hillside slope, this three storey house has a modern, minimalist exterior featuring alternating layers of marble and glass walls. Wide windows blur the boundary between indoors and out, illuminating interiors with natural light and providing a direct connection to nature. Inside, the high ceiling of the open-to-above living room introduces a modern edge with real livability. A sophisticated interior design black-and-white palette matches the home’s clean, straight lines and bold architectural details. Virtually every room offers immediate access to a landscaped terrace or ground-floor courtyard, where even a water feature lined with smooth grey river rocks matches the home’s soothing sense of calm. And just as peaceful but on a large scale, an 80m2 geometric pool winds its way through the outdoor Travertine deck. A-Cero Architecture.