Amid the rugged and sparse landscape of Joshua Tree sits the El Cemento Uno House. The 1,674 square foot retreat is set on five acres of land, nestled within a boulder field where the structure appears to almost float above the natural rock formations. The rectangular building is constructed of RSG 3-D, a panel system consisting of a polystyrene core sandwiched between steel wire grids, which is then covered in concrete. The result is a fireproof and earthquake-resistant shell that’s also energy-efficient – perfect for the extremes of the desert. The home is up for sale now for $1.7M. With two master suites and an extra powder room, it makes for a perfect weekend getaway or vacation rental property.